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8cr20si2ni不锈钢

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产品编号 8cr20si2ni不锈钢
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牌号:8Cr20Si2Ni

 标准:GB/T 1221-1992

1,化学成分:

碳 C :0.75~0.8

硅 Si:1.75~2.25

锰 Mn:0.20~0.60

硫 S :≤0.030

磷 P :≤0.030

铬 Cr:19.00~20.50

镍 Ni:1.15~1.65

2,力学性能:

抗拉强度 σb (MPa):淬火回火,≥885

条件屈服强度 σ0.2 (MPa):淬火回火,≥685

伸长率 δ5 (%):淬火回火,≥10

断面收缩率 ψ (%):淬火回火,≥15

冲击功 Akv (J):淬火回火,≥8

硬度 :退火,≤321HB;淬火回火,≥262HB

3,特性及适用范围: 用作耐磨性为主的吸气、排气阀、阀座等。

 ●交货状态:一般以热处理规范状态交货,其热处理种类在合同中注明;未注明者,按不热处理状态交货。

热处理工艺:

热处理规范:1)退火,800~900℃缓冷或约720℃空冷;

2)淬火,1030~1080℃油冷;

3)回火,100~800℃快冷。

 金相组织:组织特征为马氏体型。


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