二、55#钢简介：55号钢定轧交货材质保证，钢板质量可靠，价格周期都可以受控
55#是碳素结构用钢，55#钢含碳量0.55%，热处理多采用调质，55钢含碳量大，淬火后硬度高些（HRC63左右）。55#钢为高强度中碳钢，经处理后有高的表面硬度和强度，但塑性、韧性较差，切削加工性能中等，焊接性、淬透性差，水淬具有形成裂纹的倾向。三、55#钢执行标准：执行GB/标准。四、55#钢交货状态：以不热处理或热处理（退火、正火或高温回火）状态交货。要求热处理状态交货的应在合同中注明，未注明者按不热处理交货。五、55#钢化学成分.52～0.600.17～0.370.50～0.80≤0.035≤0.035≤0.25≤0.30≤0.25六、55#钢力学性能，55号钢定轧交货材质保证，钢板质量可靠，价格周期都可以受控
抗拉强度σb/Mpa屈服强度伸长率断面收缩率硬度≥645(66)≥380(39)≥13≥35未热处理,≤255HB;退火钢,≤217HB七、55#钢特性及适用范围55#钢为高强度中碳钢，经处理后有高的表面硬度和强度，但塑性、韧性较差，切削加工性能中等，焊接性、淬透性差，水淬具有形成裂纹的倾向。55钢一般在正火或淬火后使用，用作要求较高的强度和耐磨性或弹性、动载荷及冲击负荷不大的零件，如齿轮、轮缘、扁弹簧、曲轴等，也可作铸件。
Brand : 55#
Ii. Brief of 55# steel
No.55 steel is with of 0.55%. is used in heat while no.55 steel has large and after (HRC63).55# steel is high steel. After it has high and but poor and poor and and water has the to form .
Iii. 55# steel : GB/ .
Iv. state of 55# steel: in the state of no heat or heat ( or high ).The in the of heat shall be in the . If it is not the shall be made heat .
V. 55#
C Si Mn S P Cr Ni Cu
0.52 ~ 0.60 0.17 ~ 0.37 0.50 ~ 0.80 ≤0.035 ≤0.035 ≤0.30 ≤0.25
Vi. of 55# steel
B /Mpa Yield rate
≥645(66) ≥380(39) ≥13 ≥35 No heat ≤255HB; 217 hb or less
Vii. 55# steel and scope
55# steel is high steel. After it has high and but poor and poor and and water has the to form . used after or 55 steel is used for parts that high and wear or small load and load, such as flat etc., and can also be used as .