TOOL STEEL AISI A2

Category	Steel
Class	Tool steel
Type	Air-hardening medium-alloy cold work steel
Designations	France: AFNOR Z 100 CDV 5 Germany: DIN 1.2363 Japan: JIS SKD 12 Sweden: SS 2260 United Kingdom: B.S. BA 2 United States: ASTM A681 , FED QQ-T-570 , SAE J437 , SAE J438 , UNS T30102

Composition

Element	Weight %
C	0.95-1.05
Mn	1.00
Si	0.50
Cr	4.75-5.50
Ni	0.30
Mo	0.90-1.40
V	0.15-0.50
Cu	0.25
P	0.03
S	0.03

Mechanical Properties

Properties		Conditions
		T (°C)	Treatment
Density (×1000 kg/m3)	7.86	25
Poisson's Ratio	0.27-0.30	25
Elastic Modulus (GPa)	190-210	25

Thermal Properties

Properties		Conditions
		T (°C)	Treatment
Thermal Expansion (10-6/ºC)	10.7	20-100

Source: efunda.com

DIFFERENCE BETWEEN A2 & A4 STAINLESS BOLTS

A2 and A4 stainless steel bolts are used for their non-corrosive qualities.

The DIN/ISO A2 and DIN/ISO A4 stainless bolts are two common types of stainless steel fasteners that come in different sizes. A2 bolts are also known as ASTM 304 or 18-8, while the A4 is also known as "marine" bolts or ASTM 316. Because of the non-corrosive nature of stainless steel, both types of fasteners are used for many applications, ranging from the automotive and marine industry to architecture and do-it-yourself home improvements.

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COMPARISON OF VARIOUS TOOL STEEL STANDARDS

Comparison of international standards - tool steel specifications

Great Britain BS4659	U.S.A AISI/SAE	Germany W-Nr Din	Italy UNI	Japan Jis	France AFNOR	Spain UNE
B01	O1	1.2510 100MnCrW4	95MnWCr5KU	~SKS3	90MnWCrV5 90MWCV5	F.5220 95MnCrW5
BD2	D2	1.2379 X155CrVMo12-1	X155CrVMo121KU	SKD11	X160CrMoV12-28 32CDV12-28	F.520A
BD3	D3	1.2080 X210Cr12	X205Cr12KU	SKD1	X200Cr12 Z200C12	F.5212 X210Cr12
BD6	~D6	1.2436	-	-	-	-
BA2	A2	1.2363 X100CrMoV5-1	X100CrMoV511KU	SKD12	X100CrMoV5 Z100CDV5	F5.227 X100CrMoV5
BH13	H13	1.2344 X40CrMoV5-1	X40CrMoV511KU	SKD61	X40CrMoV5 Z40CDV5	F.5318 X40CrMoV5
BS1	S1	1.2550 60WCrV7	55WCrV8KU	-	55WC20	F.5241 45WCrSi8
BP20	P20	1.2311 40CrMnMo7	-	-	-	-
-	420	1.2083 X42Cr13	-	SUS420J2	X40Cr13 Z40C14	-
~BP30	-	1.2767 X45NiCrMo4	~42NiCrMo157	SKH51-	~Y 35NCD16	-
BM2	M2	1.3343 S6 502	-	-	Z85WDCV 06-05-04-02	-
BM42	M42	1.3247 S2-1-1-8	HS2-9-1-8	SKH59	Z110DKCWV 09-08-04-02-01	6-5-2
BW2	W2	1.2833	-	-	105MV01	-
BS1407	-	1.2002	-	-	120C2	-

Source: westyorkssteel