B4

2023-05-17 17:01:38 来源：钢铁之家阅读量：0

牌号	B4
对应标准	BS 3100-1991 一般工程用铸钢件 Specification for Steel castings for general engineering purposes
归类	铸钢
标签	高温用合金钢铸钢

B4 化学元素成分含量(%)

成分	C	Si	Mn	P	S	Cr	Ni ^②	Cu ^②	Mo
最小值	-	-	0.3	-	-	2.5	-	-	0.35
最大值	0.25	0.75	0.7	0.04	0.04	3.5	0.4	0.3	0.6

①碳含量每降低0.01%，最大锰含量则增加0.04%，允许最大锰含量到1.1%
②残余元素。

碳当量计算

B4 机械性能

热处理或状态	抗拉强度 σ_b Mpa	屈服点 σ_s Mpa	断后伸长率或延伸率 δ %	冲击吸收能量 KV2 J
N+T或OQ+T或WQ+T(T 720°C max)	≥620	≥370	≥13	≥25

A=for anneal by heating to a temperature above the AC3 and cool in the furnace
N=for normalize by heating to a temperature above the AC3 and cool in still air
OQ=for quench into oil from a temperature above the AC3
WQ=for quench into water from a temperature above the AC3
AH=for air harden by heating to a temperature above the AC3 and cool in air at a rate fast enough to produce a hardened microstructure
T=for temper by heating to a temperature below AC1
ST=for solution treat by heating to temperature high enough to dissolve and any intermetallic phases followed by a rapid cool.

如果买方要求对这些等级进行冲击试验，则不进行弯曲试验。

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