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

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)爆阶，則不進(jìn)行彎曲試驗(yàn)蚜遥。