Alloy 699 XA: Chemical Composition, Properties, Equivalent Grades, and Applications

VDM® Alloy 699 XA, also known as Nicrofer 6830 Al, is a high-temperature nickel-based alloy developed by VDM Metals (a company under ACERINOX). This alloy is designed for exceptional performance in extreme environments, offering excellent resistance to carburization, metal dusting, oxidation, and creep at temperatures up to 1,000°C (1,832°F). Below is a summary of its key characteristics, including chemical composition, properties, equivalent grades, and applications.

Chemical Composition

VDM® Alloy 699 XA has a carefully balanced composition to ensure its high-temperature performance:

• Nickel (Ni): Balance
• Chromium (Cr): 26.0–30.0% (enhances oxidation and carburization resistance)
• Aluminum (Al): 1.9–3.0% (forms a protective alumina layer)
• Iron (Fe): ≤2.5% (low iron content improves metal dusting resistance)
• Manganese (Mn): ≤0.5%
• Silicon (Si): ≤0.5%
• Titanium (Ti): ≤0.6%
• Niobium (Nb): ≤0.6%
• Copper (Cu): ≤0.5%
• Zirconium (Zr): ≤0.1%
• Carbon (C): 0.005–0.1%
• Nitrogen (N): ≤0.05%
• Phosphorus (P): ≤0.000%
• Sulfur (S): ≤0.01%
• Boron (B): ≤0.008%

This composition, as per UNS N06699 and DIN 17742 standards, ensures the alloy’s durability in harsh conditions.

Properties

VDM® Alloy 699 XA exhibits a combination of mechanical, physical, and corrosion-resistant properties:

• Physical Properties:
  • Density: 8.02 g/cm³ (0.29 lb/in³) at 20°C.
  • Melting Range: 1,370–1,390°C (2,498–2,534°F).
  • Thermal Conductivity: Increases from 10.5 W/m·K at 20°C to 26.4 W/m·K at 1,000°C.
  • Coefficient of Thermal Expansion: 13.8×10⁻⁶/K at 20°C, rising to 17.9×10⁻⁶/K at 1,000°C.
• Mechanical Properties (Solution-Annealed Condition):
  • Yield Strength (R_p0.2): 240 MPa at 20°C, decreasing to 120 MPa at 700°C.
  • Tensile Strength (R_m): 610 MPa at 20°C.
  • Elongation (A): 40% at 20°C.
  • Hardness: 84 HRB.
  • Impact Strength (ISO V-notch): ≥70 Joule at 20°C.
• Corrosion Resistance:
  • Outstanding resistance to carburization and metal dusting due to high Cr, Al additions, and low Fe content.
  • Superior oxidation resistance up to 1,000°C, comparable to VDM® Alloy 602 CA, thanks to a tight, adherent alumina layer.
• Creep Resistance: Matches the performance of VDM® Alloy 601, with a design life of 100,000 hours under statistical creep conditions.
• Workability: Comparable to VDM® Alloy 601, with good weldability in pure argon environments.

Equivalent Grades

VDM® Alloy 699 XA is standardized under:

• UNS: N06699
• DIN: 2.4842 – NiCr30Al
• Applicable standards include DIN 17742, ASTM B166/B168 (for rod, bar, sheet, plate, strip), and ISO 18274 (for welding materials).

Applications

VDM® Alloy 699 XA is widely used in high-temperature applications within the chemical and petrochemical industries, including:

• Reformers: For chemical and petrochemical processes.
• Methanol and Ammonia Synthesis: In production plants requiring high resistance to corrosive gases.
• Hydrogen Production: For components exposed to high temperatures and carburizing environments.
• Syngas Cooling in E-Fuel Production: To handle extreme thermal and chemical stresses.

Conclusion

VDM® Alloy 699 XA is a high-performance alloy tailored for demanding high-temperature environments. Its unique chemical composition ensures excellent resistance to carburization, metal dusting, and oxidation, while its mechanical properties and workability make it a reliable choice for critical applications in the chemical, petrochemical, and energy sectors. With equivalent grades recognized internationally, this alloy is a versatile solution for industries requiring durability and performance under extreme conditions.

Understanding Metal Dusting and the Role of VDM® Alloy 699 XA

What is Metal Dusting?

Metal dusting is a complex form of high-temperature corrosion closely related to carburization, occurring in environments with high carbon activity. Despite over 50 years of research, not all mechanisms of metal dusting are fully understood. This phenomenon typically manifests between 400°C and 800°C, where the material surface experiences localized attacks in the form of troughs or holes. These attacks appear randomly distributed, and nearby, dark grey to black dust-like corrosion products form—hence the term "metal dusting." The risk of metal dusting increases with high carbon concentrations in the process gas or on the material surface, influenced by factors such as gas pressure, flow velocity, and time. The incubation period (time until initial material damage) is extended with higher alloying content of elements like nickel, chromium, aluminum, and silicon.

Mechanisms and Control of Metal Dusting

Metal dusting involves the catalytically controlled decomposition of carbon compounds into elemental carbon, which plays a central role in the corrosion process. Effective control requires action on both the material and process sides to block this catalytic activity, thereby interrupting the reaction chain leading to metal dusting. Recent material advancements, such as VDM® Alloy 699 XA, have significantly extended the incubation period while limiting the depth of damage, offering improved resistance to this form of corrosion.

VDM® Alloy 699 XA: A Solution to Metal Dusting

VDM® Alloy 699 XA (designated as 2.4842/N06699) is a high-temperature nickel-based alloy specifically engineered to combat metal dusting and other forms of high-temperature corrosion. Its key characteristics include:

• Excellent Metal Dusting Resistance: The alloy’s composition, with high levels of nickel, chromium, and aluminum, and low iron content, significantly delays the onset of metal dusting and reduces the severity of localized attacks.
• Creep Resistance: VDM® Alloy 699 XA offers creep resistance comparable to VDM® Alloy 601, ensuring long-term structural integrity under high-temperature stress, with a design life of up to 100,000 hours.
• Good Workability (Welding): The alloy can be easily welded in pure argon environments, making it practical for fabrication in industrial applications.

Conclusion

Metal dusting remains a challenging form of high-temperature corrosion due to its complex mechanisms and random attack patterns. However, advancements in material science, exemplified by VDM® Alloy 699 XA, provide a robust solution. With its excellent resistance to metal dusting, strong creep resistance, and good workability, this alloy is well-suited for demanding applications in industries such as chemical processing, petrochemical production, and syngas-related processes, where high carbon activity and elevated temperatures are prevalent.

Download datasheet

Steel grades of 18CrNiMo7-6

18CrNiMo7-6 is a case-hardening steel known for its exceptional toughness. There are several variants of this steel that have stringent cleanliness requirements and possess narrower composition ranges compared to the standard version. 

One specific variant, designated as IQ (isotropic quality), is produced to have an extremely low number of elongated sulfide inclusions, resulting in more isotropic properties. The high level of oxidic cleanliness in this variant allows it to meet the same demanding cleanliness standards as re-melted qualities.

Grade 159A: This variant has a low sulfur content and is designed to meet high cleanliness requirements.

Grade 159B: This variant has controlled sulfur content, ensuring consistent machinability and +H hardenability.

Grade 159Q: This variant offers isotropic properties (IQ) and improved fatigue strength due to higher cleanliness levels. It also exhibits a finer size and distribution of non-metallic inclusions.

Grade 159X: Similar to Grade 159B, this variant has controlled sulfur content for consistent machinability and +H hardenability.

Grade 159S: This variant has an increased sulfur content.

Grade 4761 (MoCN216): This is a low-sulfur variant of Imatra steel, offering specific characteristics.

IQ-Steel® is an isotropic quality ultra-clean steel optimized for high fatigue strength under multi-axial loading.

Similar designations

1.6587, AISI4820, DIN17CrNiMo6, 18CND6, EN ISO 683-17

Chemical composition

Mechanical Properties

Source: ovako.com

ASTM A387 Grade 11: Chemical Composition, Properties, Equivalent grades

Introduction

The ASTM A387 specification is the Standard Specification for Pressure Vessel Plates, Alloy Steel, Chromium-Molybdenum intended primarily for use in welded boilers and pressure vessels designed for elevated temperature service.

Chrome Molybdenum steel plate, also known as Chrome Moly, is a versatile material widely used in various industries, including the oil and gas industry, nuclear industry, and fossil fuel power stations. The addition of molybdenum in the alloy composition enhances its strength and enables it to withstand higher working temperatures, while the presence of chromium enhances its corrosion resistance and resistance to oxidation.

The superior temperature tensile strength and anti-corrosive properties of Chrome Moly make it an ideal choice for applications involving saltwater exposure.

Equivalent steel grades

ASTM A387 Grade 11 equivalent steel grades:

Country	USA	USA	European	UK (British Standard)
Standards	ASTM	ASME	EN 10028	BS
Grade	A387 Grade 11	SA387 Grade 11	13CrMoSi5-5	621B

Chemical Composition

The chemical composition of AISI A387 grade 11 alloy steel is as follows:

Element Content (%)

Iron, Fe 96.16-97.6

Chromium, Cr 1.0-1.50

Silicon, Si 0.50-0.80

Manganese, Mn 0.40-0.65

Molybdenum, Mo 0.45-0.65

Carbon, C 0.050-0.17

Phosphorous, P 0.035

Sulfur, S 0.035

Mechanical Properties

The mechanical properties of AISI A387 grade 11 alloy steel are as follows:

Tensile strength 515-690 Mpa/ 74700-100000 psi.

Yield strength 310 Mpa/ 45000 psi.

Rupture strength (@575 °C, time 3.60e+8 sec/1070 °F, time 100000 hour) 37.0 - 48.0 Mpa/ 5370 - 6960 psi

Elastic modulus 190-210 Gpa/ 27557-30458 ksi.

Poisson's ratio 0.27-0.30.

Elongation at break (In 50 mm) 22.00%.

Applications

ASTM A387 Grade 11 steel is characterised by good weldability. ASTM A387 Grade 11 steel is used for manufacturing boilers, pressure vessels and pipes for the transportation of hot liquids. ASTM A387 Grade 11 steel also offer good properties at high and low temperatures. ASTM A387 Grade 11 steel is always supplied in the normalised and tempered condition.

What is ASTM SA 193 grade B16?

What is SA 193 B16?

SA 193 B16 is a specification for high-temperature bolting materials, specifically alloy steel bolting materials, published by the American Society of Mechanical Engineers (ASME).

SA 193 B16 is made from chromium-molybdenum-vanadium alloy steel and is commonly used in applications that require high strength and resistance to corrosion, oxidation, and high temperatures.

SA 193 B16 stud bolts are often used in industries such as oil and gas, petrochemical, and power generation. They are used in applications such as pipeline flanges, valve bodies, pressure vessels, boilers, turbines, heat exchangers, reactors, and compressors.

The ASTM A193 specification, which SA 193 B16 is a part of, outlines the chemical composition, mechanical properties, and testing requirements for high-temperature bolting materials. This helps to ensure that the materials used in critical applications meet a certain level of quality and reliability.

SA 193 B16 mechanical properties, chemical composition, applications

SA 193 B16 is a chromium-molybdenum-vanadium alloy steel used in high-temperature and high-pressure applications such as pressure vessels, boilers, and flanges. The following are the mechanical properties and chemical composition of SA 193 B16:

Mechanical Properties:

• Tensile strength: 125 ksi (860 MPa) minimum
• Yield strength: 105 ksi (720 MPa) minimum
• Elongation: 16% minimum
• Reduction of area: 50% minimum
• Hardness: 35 HRC maximum

Chemical Composition:

• Carbon: 0.36% - 0.47%
• Manganese: 0.45% - 0.70%
• Phosphorus: 0.035% maximum
• Sulfur: 0.040% maximum
• Silicon: 0.15% - 0.35%
• Chromium: 0.80% - 1.15%
• Molybdenum: 0.15% - 0.25%
• Vanadium: 0.10% - 0.20%

Temperature Range

ASTM a193 grade b16 bolt temperature range is between -20ºF (-30ºC) to +1100ºF (+593ºC).

Thermal Expansion Coefficient

Co-efficient of thermal expansion for ASTM a193 grade b16 bolting is approximately 7.5 x 10^6.

Applications: SA 193 B16 stud bolts are commonly used in industries such as oil and gas, petrochemical, and power generation. They are used in applications that require high strength and resistance to corrosion, oxidation, and high temperatures. Some common applications of SA 193 B16 include:

• Pipeline flanges
• Valve bodies
• Pressure vessels
• Boilers
• Turbines
• Heat exchangers
• Reactors
• Compressors

It is important to ensure that any SA 193 B16 stud bolts being used meet the ASTM A193 specification and are installed and tightened according to the manufacturer's recommended torque specifications to ensure their performance and reliability.

 

A217 GR.WC6 properties

A217 GR.WC6 is a high-strength low-alloy steel that is commonly used in high-temperature and pressure applications. In this article, we will explore the mechanical properties, chemical composition, equivalent grades, and applications of A217 GR.WC6.

Equivalent Grades: A217 GR.WC6 has several equivalent grades that have similar chemical compositions and mechanical properties. Some of the equivalent grades are:

• ASTM A182 F11
• ASTM A335 P11
• BS 1503 Grade 621-440
• DIN 1.7335
• ASME SA217
• UNS J42045

Chemical Composition: The chemical composition of A217 GR.WC6 is as follows:

• Carbon (C): 0.05-0.20%
• Manganese (Mn): 0.50-0.80%
• Silicon (Si): 0.50-1.00%
• Chromium (Cr): 1.00-1.50%
• Molybdenum (Mo): 0.44-0.65%
• Nickel (Ni): 0.50% maximum
• Phosphorus (P): 0.03% maximum
• Sulfur (S): 0.03% maximum

Mechanical Properties: The mechanical properties of A217 GR.WC6 are as follows:

• Tensile strength: 415 MPa (60,000 psi) minimum
• Yield strength: 205 MPa (30,000 psi) minimum
• Elongation: 20% minimum
• Reduction of area: 35% minimum
• Hardness: 197-241 HBW

Applications: A217 GR.WC6 is primarily used in high-temperature and pressure systems, including:

• Boiler components: A217 GR.WC6 is used to cast boiler components such as steam tubes, flanges, gaskets, and handles.
• High-pressure piping: A217 GR.WC6 is used to cast high-pressure piping components such as pipes, flanges, valves, and fittings.
• Pumps: A217 GR.WC6 is used to cast pump components such as handles, shafts, and impellers.
• Valves: A217 GR.WC6 is used to cast valve components such as valve bodies, flanges, and handles.

Components cast from A217 GR.WC6 have high strength, can withstand high pressure and temperature, and have good resistance to corrosion and erosion, especially in acidic environments. Overall, A217 GR.WC6 is a versatile steel that can be used in a wide range of applications where high-strength and corrosion-resistant materials are required.

Properties of LEAN DUPLEX UNS S32101 - ALLOY 1.4162 - LDX 2101

ALLOY 1.4162 / LEAN DUPLEX UNS S32101 / LDX 2101

MATERIAL DESCRIPTION

LDX 2101 is a low Ni-alloyed duplex with balanced chemistry of chromium, molybdenum and nitrogen content to achieve good resistance to localized and uniform corrosion. The duplex microstructure contributes to the high strength and high resistance to stress corrosion cracking. Duplex steels have good weldability. Due to risk of embrittlement, LDX 2101 should not be used at temperatures above 250°C. Very price stable high strength alloy.

LDX 2101 is a low-nickel, nitrogen enhanced lean duplex stainless steel developed for general-purpose use. The austenitic-ferritic (duplex) structure of the alloy is balanced to approximately equal amounts of ferrite and austenite in the solution-annealed condition.

The high chromium and nitrogen content of LDX 2101, combined with an addition of molybdenum, provide very good resistance to localized and uniform corrosion. The duplex microstructure contributes to the alloys high strength and resistance to chloride stress-corrosion cracking. LDX 2101 possesses both superior strength and greater chloride stress-corrosion cracking resistance than conventional 300 series stainless steels.

The corrosion resistance of LDX 2101 is generally good making it suitable for use in a wide variety of applications. In most environments, it is superior to 304L stainless steel and comparable to the molybdenum containing 316L stainless steel.

The enhanced mechanical strength of LDX 2101 is far superior to conventional 300 series stainless steels enabling it to be used in thinner cross-sections which can provide significant cost savings to the end user.

LDX 2101 exhibits good abrasion and erosion resistance and can be fabricated using standard shop practices developed for duplex stainless steels.

APPLICATIONS

The main applications are for details with corrosion resistance better than 304L.

General corrosion is characterized as a uniform attack on a surface in contact with a corrosive medium. The resistance to uniform corrosion in sulfuric acid is shown below. LDX 2101 is superior to 304L and in some cases comparable to 316L.

LDX 2101 is characterized by:

• Ideal for tank production where corrosion strength is sufficient.

• Good resistance to stress corrosion cracking.

• Good resistance to general corrosion.

• High mechanical strength.

• High resistance to erosion corrosion and corrosion fatigue.

Heat Treatment

Solution annealing at 1020 – 1100°C followed by water quenching.

Weldability
Very good.

CHEMICAL COMPOSITION

Weight %	C	Si	Mn	S	P	Cr	Ni	Mo	N	Cu
Min.			4,00			21,00	1,35	0,1	0,20	0,10
Max.	0,040	1,00	6,00	0,015	0,035	22,00	1,90	0,8	0,25	0,80

Product Standards: EN 10088-2, EN 10088–4, ASTM A240, EN ISO 9445-2
Approvals: NACE MR0175/ ISO 15156-3:2015, PED 97/ 23/ EC, CPR 305/ 2011/ EU

MECHANICAL PROPERTIES

	Yield strength Rp0.2, MPa	Tensile strength Rm, MPa	Elongation [%]	Hardness [HB]	Impact, Charpy-V, -40ºC [J]	Pre	Surface
PLATE CR (COIL)	≥ 530	≥ 700	≥ 30		≥ 50	26	2B/2E
PLATE HR (COIL)	≥ 450	≥ 650	≥ 30	≤ 290	≥ 50	26	1D
PLATE (QUARTO)	≥ 450	≥ 650	≥ 30	≤ 290	≥ 27	26	1D

 

Download the Alloy LDX2101 Specification Document (PDF)

Source:

Alloy Steel AISI 4142

Alloy Steel 4142 Forging

Introduction

AISI 4142 is a Standard grade Alloy Steel. It is commonly called AISI 4142 Chromium-molybdenum steel. It is composed of (in weight percentage) 0.40-0.45% Carbon (C), 0.75-1.00% Manganese (Mn), 0.035%(max) Phosphorus (P), 0.04%(max) Sulfur (S), 0.15-0.30% Silicon (Si), 0.80-1.10% Chromium (Cr), 0.15-0.25% Molybdenum (Mo), and the base metal Iron (Fe). Other designations of AISI 4142 alloy steel include UNS G41420 and AISI 4142.

Equivalent materials to AISI 4142 alloy steel are:

• ASTM A322
• ASTM A331
• ASTM A505
• ASTM A519
• ASTM A547
• SAE J404
• SAE J412
• SAE J770
• ASTM A29
• ASTM A372 (VIII)
• ASTM A711
• ASTM A752
• ASTM A829
• SAE J1397

 Chemical Composition
The following table shows the chemical composition of AISI 4142 alloy steel.

Element	Content (%)
Iron, Fe	≥ 96.725
Chromium, Cr	0.80-1.10
Manganese, Mn	0.75-1.10
Carbon, C	0.40-0.45
Silicon, Si	0.15-0.30
Molybdenum, Mo	0.15-0.25
Sulfur, S	≤ 0.040
Phosphorous, P	≤ 0.035

Physical Properties

The physical properties of AISI 4142 alloy steel are outlined in the following table.

Properties	Metric	Imperial
Density	7.85 g/cm3	0.284 lb/in³

Mechanical Properties

The mechanical properties of AISI 4142 alloy steel are highlighted below.

Properties	Metric	Imperial
Elastic modulus	190-210 GPa	27557-30458 ksi
Bulk modulus (typical for steel)	140 GPa	20300 ksi
Shear modulus (typical for steel)	80 GPa	11600 ksi
Poisson’s ratio	0.27-0.30	0.27-0.30
Hardness, Brinell (annealed and cold drawn)	187-229	187-229
Hardness, Knoop (converted from Brinell hardness)	230	230
Hardness, Rockwell B (converted from Brinell hardness)	94	94
Hardness, Rockwell C (converted from Brinell hardness, value below normal HRC range, for comparison purposes only)	15	15
Hardness, Vickers (converted from Brinell hardness)	218	218
Machinability (annealed and cold drawn, based AISI 1212 steel, as on 100 machinability)	65	65

Alloy Steel 4142 Forging

Thermal Properties

The thermal properties of AISI 4142 alloy steel are outlined below.

Properties	Metric	Imperial
Thermal conductivity	42.6 W/mK	296 BTU in/hr.ft².°F

Source: azom and efunda

CF-3M: Corrosion Resistant Alloy Property Data

Stainless Steel SA351 CF3M, Butterfly valve

DESCRIPTION
CF-3M is a Fe-Cr-Ni-Mo alloy that is the cast equivalent of wrought, low carbon, AISI 316L stainless steel. The low carbon content of the alloy results in greater resistance to sensitization of the welds. Consequently, it is most commonly used in applications where post-weld heat treatment cannot be applied. Optimum corrosion resistance is reached after solution annealing at 1900 to 2050oF followed by rapid cooling. It has good resistance to organic acids and salts, sulphuric and sulfurous acids, phosphoric and phosphoric-sulphuric-hydrofluoric acid mixtures, sulfate and sulfite liquors, seawater and other chloride solutions, sodium hydroxide and steam. A modified form of the alloy, known as CF-3MA, has higher strength than the normal CF-3M. This is achieved by balancing the composition to produce a higher range of ferrite than the 20% present in the CF-3M grade.

RELATED SPECIFICATIONS
ASTM A351(CF3M and CF3MA), A743(CF-3M), A744(CF-3M), A 451 (CPF3M), J92800 Nearest wrought grade: AISI 316L.

COMPOSITION
                 C         Mn     Si         Cr      Ni    Mo         P      S
Min %                                       17.0    9.0    2.0       
Max %    0.03    1.50    1.50    21.0    13.0    3.0    0.04    0.04

APPLICATIONS
Impellors, propellors, pump casings, suction manifolds and valve bodies.

PRODUCT FORMS
Horizontal and vertical centrifugal castings; static castings.

PHYSICAL PROPERTIES
Density (lbs/in3)      0.280
Liquidus(oF)            2600
Thermal Conductivity     9.4 @ 212oF;
(Btu/h/ft2/ft/oF)              12.3 @ 1000oF
Thermal Expansion         8.9 @ 70-212oF
(10-6in/in oF)                  9.7 @ 70-1000oF
Magnetic Permeability    1.2 to 3.1

MECHANICAL PROPERTIES
(Typical Values at Room Temperature - Solution Annealed >1900oF, Water Quenched.)
ASTM Specs A351 and A743
                                   CF-3M    CF-3MA      A743 CF-3M    A351CF-3A
U.T.S.           K.S.I.    80               90                     70 Min         77 Min.
Y.S.               K.S.I.    38               45                      30 Min        35 Min.
Elong.            %         55               45                      35 Min         35 Min
Brinell           H B      150            170       
Charpy 'V'    ft-lbs    120              100       

WELDABILITY
CF-3M may be welded by the SMAW, GTAW and GMAW processes.
Electrodes    308Mo, 316, 317, 316L, 308MoL.
Preheat    Not required.
Post weld heat treatment Not normally required

Source: Kubota Metal Corporation

Alloy Steel ASTM A588 Grade A: Composition

ASTM A588 Grade A is categorized as Alloy Steel.

Composition

Weight           Element
0.10-0.19%    Carbon (C),
0.90-1.25%    Manganese (Mn),
0.04%            Phosphorus (P),
0.05%            Sulfur (S),
0.15-0.30%   Silicon (Si),
0.40-0.65%   Chromium (Cr),
0.02-0.10%   Vanadium (V),
0.25-0.40%   Copper (Cu),

and the base metal Iron (Fe).

Another common designation of ASTM A588 Grade A alloy steel is UNS K11430.

Alloy Steel ASTM A588 Grade B: Composition, Properties

ASTM A588 Grade B is categorized as Alloy Steel. It is composed of (in weight percentage) 0.20%(max) Carbon (C), 0.75-1.25% Manganese (Mn), 0.04% Phosphorus (P), 0.05% Sulfur (S), 0.15-0.30% Silicon (Si), 0.40-0.70% Chromium (Cr), 0.50%(max) Nickel (Ni), 0.001-0.10% Vanadium (V), 0.20-0.40% Copper (Cu), and the base metal Iron (Fe).

Another common designation of ASTM A588 Grade B alloy steel is UNS K12043.

Composition

Element    Weight %
C           0.20 (max)
Mn        0.75-1.25
P           0.04
S           0.05
Si          0.15-0.30
Cr         0.40-0.70
Ni         0.50 (max)
V          0.001-0.10
Cu        0.20-0.40

Mechanical Properties

Properties		Conditions
		T (°C)	Treatment
Density (×1000 kg/m3)	7.7-8.03	25
Poisson's Ratio	0.27-0.30	25
Elastic Modulus (GPa)	190-210	25

Source: efunda.com

CF8M corrosion resistant alloy : composition, applications, properties and weldability

DESCRIPTION

CF-8M is a molybdenum bearing modification of of CF8 alloy and is the cast equivalent of wrought AISI 316 stainless steel. The presence of molybdenum increases the general corrosion resistance and the resistance to pitting by chlorides. The alloy is used in mildly acidic and alkaline conditions and for handling citric, oxalic and phosphoric acids.

COMPOSITION
                     C         Mn      Si        Cr    Ni      Mo      P        S
Min %                                 18        9    2.0
Max %        0.08    1.50     2.0(i)   21     12      3.0    0.04    0.04
Notes (i) Silicon 1.5% Max in ASTM A351

APPLICATIONS
Impellors, propellors, pump casings, valve bodies, press plates.

PRODUCT FORMS
Horizontal and vertical centrifugal castings; static castings.

PHYSICAL PROPERTIES
Density (lbs/in3)              0.280
Liquidus(oF)                   2550
Thermal Conductivity      9.4 @ 212oF
(Btu/h/ft2/ft/oF)              12.3 @ 1000oF
Thermal Expansion         8.9 @ 70-212oF
(10-6in/in oF)                 9.7 @ 70-1000oF
Magnetic Permeability    1.5-2.5

MECHANICAL PROPERTIES
(Typical Values at Room Temperature - Solution Annealed at 1950-2100oF, Water Quenched.)
                                                                                     ASTM Specs A351, A743 & A744
U.T.S.                  K.S.I.                   80.0                     70  Min
Y.S.                     K.S.I.                   42.0                      30 Min
Elong.                  %                          50                        30 Min
Brinell                  H B                       156-170
Charpy 'Key'       ft-lbs                     52 @ -400oF

WELDABILITY
CF-8M may be welded by the SMAW, GTAW and GMAW processes.
Electrodes
Preheat                                   None
Post weld heat treatment         1900oF min. water quench
Procedures for welding CF-8M alloy are available from Kubota Metal Corporation.

RELATED SPECIFICATIONS
ASTM A351, A743, A744, , J92900
Nearest wrought grade: AISI 316.

Download .pdf version

Source: http://www.kubotametal.com