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牌號	B7
對應標準	BS 3100-1991 一般工程用鑄鋼件 Specification for Steel castings for general engineering purposes
歸類	鑄鋼
標簽	高溫用合金鋼鑄鋼

B7 化學元素成分含量(%)

成分	C	Si	Mn	P	S	Cr	Ni ^②	Cu ^②	Mo	V	Sn ^②
最小值	0.1	-	0.4	-	-	0.3	-	-	0.4	0.22	-
最大值	0.15	0.45	0.7	0.03	0.03	0.5	0.3	0.3	0.6	0.3	0.025

①碳含量每降低0.01%，最大錳含量則增加0.04%，允許最大錳含量到1.1%
②殘余元素。

碳當量計算

B7 機械性能

熱處理或狀態	抗拉強度 σ_b Mpa	屈服點 σ_s Mpa	斷后伸長率或延伸率 δ %
N+T(N 950°C to 1000°C, T 720°C max)	≥510	≥295	≥17

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.

B7 對應不同標準

1	ASTM A193/A193M-2001 高溫設備用合金鋼和不銹鋼螺栓材料的標準規范
	B7 CrMo
2	ASTM A485-2014 高淬透性耐磨軸承鋼的技術規范
	B7 A485 100CrMo 7-4
3	ASTM A485-2017 高淬透性耐磨軸承鋼的技術規范
	B7 100CrMo 7-4
4	BS 3100-1991 一般工程用鑄鋼件
	B7
5	Q/ASB 234-2018 冷鐓鋼盤條
	B7

注：數據僅供參考！如有疑問，請填寫"我要糾錯"！

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