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Chemical composition of SK4

Carbon C:0.95 ~ 1.04

Silicon Si: less than or equal to 0.35

Manganese: less than 0.40 Mn

Sulfur: less than 0.030 S

P: less than 0.035 P

Cr Cr: allows residual content less than 0.25, less than 0.10 (manufacturing lead bath quenching steel wire)

Nickel: allows the residual Ni content less than 0.20, less than 0.12 (manufacturinglead bath quenching steel wire)

Cu: allows the residual copper content less than 0.30, less than 0.20 (manufacturinglead bath quenching steel wire)

Note: the allowable residual content of Cr+Ni+Cu is less than or equal to 0.40(manufacturing lead bath quenching steel wire)

Hardness: annealing, is less than or equal to 197HB, the indentation diameter greater than or equal to 4.30mm = 50HRC; quenching, heat treatment and microstructure of SK4 specification

Heat treatment quenching specimen specification: 760 to 780 DEG C, cooling.

Supply hardness:

Soft, semi hard, hard (hard material heat treatment)

The color of the surface:

White, blue, golden color, heat treatment

Delivery state: Steel in annealing state of delivery. By mutual agreement, may also notannealed state of delivery.

SK4化學成分
碳 C ：0.95～1.04
 
硅 Si：≤0.35
 
錳 Mn：≤0.40
 
硫 S ：≤0.030
 
磷 P ：≤0.035
 
鉻 Cr：允許殘余含量≤0.25、≤0.10(制造鉛浴淬火鋼絲時)
 
鎳 Ni：允許殘余含量≤0.20、≤0.12(制造鉛浴淬火鋼絲時)
 
銅 Cu：允許殘余含量≤0.30、≤0.20(制造鉛浴淬火鋼絲時)
 
注：允許殘余含量Cr+Ni+Cu≤0.40(制造鉛浴淬火鋼絲時)
 
硬度 ：退火,≤197HB,壓痕直徑≥4.30mm;淬火,≥50HRC                                                                                                       sk4熱處理規范及金相組織
熱處理規范：試樣淬火760～780℃,水冷。
供貨硬度：
軟態、半硬、硬態（熱處理硬料）
表面顏色：
白色、藍色、金黃、熱處理原色
交貨狀態：鋼材以退火狀態交貨。經雙方協議，也可以不退火狀態交貨。