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【适用标准】
GB/T 222 钢的成品化学成分允许偏差比
GB/T 223 钢铁及合金化学分析方法
GB/T 228 金属材料室温拉伸试验方法
GB/T 2975 钢及钢产品力学性能试验取样位置及试样制备
GB/T 6394 金属平均晶粒度测定方法
GB/T 20066 钢和铁化学成分测定用试样的取样和制样方法
GB/T 10561 钢中非金属夹杂物含量的测定和标准评级图显微检验法
GB/T 13298 金属显微组织检验方法
GB/T 230 金属材料洛氏硬度试验
GB/T4340 金属材料维氏硬度试验
YB/T5293 金属材料冷顶锻试验
执行标准: GB6478-2001《冷镦和冷挤压用钢》
【热处理】： 球化退火
【表面处理】：磷皂化
【材质】: 合金结构钢：35CrMoA
【力学性能】:产品硬度（86-92HRB）；抗拉强度 Mpa（根据客户要求）；屈服度 Mpa（根据客户要求)；
断面收缩率等试验测试。
【用途】： 40Cr钢是机械制造业使用最广泛的钢之一。调质处理后具有良好的综合力学性能，良好的低温冲击韧性和低的缺口敏感性。钢的淬透性良好，水淬时可淬透到Ф28～60mm,油淬时可淬透到Ф15～40mm。这种钢除调质处理外还适于氰化和高频淬火处理。切削性能较好，当硬度为HB174～229时，相对切削加工性为60%。该钢适于制作中型塑料模具。
【化学成分】
碳 C ：0.37～0.44
硅 Si：0.17～0.37
锰 Mn：0.50～0.80
铬 Cr：0.80～1.10
硫 S ：允许残余含量≤0.035
磷 P ：允许残余含量≤0.035
镍 Ni：允许残余含量≤0.30
铜 Cu：允许残余含量≤0.030
Applicable standards
The chemical composition of the finished product of GB/T 222 steel allows for the deviation ratio
GB/T 223 method for chemical analysis of steel and alloy
Tensile test method for GB/T 228 metallic materials at room temperature
Mechanical properties of GB/T 2975 steel and steel products, sampling position and sample preparation
Method for determination of average grain size of GB/T 6394 metals
Sampling and sample preparation method for the determination of the chemical composition of GB/T 20066 steel and iron
Determination of non metallic inclusion content in GB/T 10561 steel and the standard method of rating chart
GB/T 13298 metal microstructure inspection method
GB/T 230 metal materials, the hardness test of metallic materials
Vivtorinox hardness test of GB/T4340 metal materials
Cold upsetting test of YB/T5293 metal materials
Executive standard: GB6478-2001 "cold heading and cold extrusion of steel"
[heat treatment]: the ball of annealing
Surface treatment: P
[material]: alloy structural steel: 35CrMoA
Mechanical properties (mechanical properties): product hardness (86-92HRB); tensile strength Mpa (according to customer requirements); yield to Mpa (according to customer requirements);
Test test of section shrinkage.
[purpose]: 40Cr steel is one of the most widely used steel in the machinery manufacturing industry. After quenching and tempering treatment, it has good comprehensive mechanical properties, good low temperature impact toughness and low notch sensitivity. The hardenability of the steel is good, water quenching can be quenched to 28 ~ 60mm, oil quenching can harden to 15 ~ 40mm. This kind of steel is also suitable for the treatment of cyanide and high frequency quenching in addition to quenching and tempering treatment. Cutting performance is good, when the hardness is HB174 ~ 229, the relative cutting process is 60%. The steel is suitable for making medium plastic mould.
Chemical composition
Carbon:0.37 C ~ 0.44
Silicon Si:0.17 ~ 0.37
Mn Mn:0.50 ~ 0.80
Chrome Cr:0.80 ~ 1.10
S: allow residual sulfur content less than 0.035
P P: allow residual content less than 0.035
Ni Ni: allow residual content less than 0.30
Cu: allow residual copper content is less than 0.030
