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B4簡(jiǎn)介

牌號(hào) B4
對(duì)應(yīng)標(biāo)準(zhǔn) BS 3100-1991
一般工程用鑄鋼件
Specification for Steel castings for general engineering purposes
歸類 鑄鋼
標(biāo)簽 高溫用合金鋼鑄鋼
B4 化學(xué)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(dāng)量計(jì)算
B4 機(jī)械性能
熱處理或狀態(tài)
抗拉強(qiáng)度
σb
Mpa 		屈服點(diǎn)
σs
Mpa 		斷后伸長(zhǎng)率或延伸率
δ
% 		沖擊吸收能量
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. 如果買方要求對(duì)這些等級(jí)進(jìn)行沖擊試驗(yàn)，則不進(jìn)行彎曲試驗(yàn)。
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