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GB /T 3098.3 - 2016 Mechanical properties of fasteners-Set screws

硬度等级
Hardness Classess
维氏硬度 HVmin 材料 热处理 C%, max C%, min P%, max S%, max
14H
22H
33H
- 45H
-
-
140 碳钢c / 0.50 / 0.11 0.15
220 碳钢d 淬火并回火 0.50 0.19 0.05 0.05
330 碳钢d 淬火并回火 0.50 0.19 0.05 0.05
450 碳钢d,e 淬火并回火 0.50 0.45 0.05 0.05
450 添加元素的碳钢d(硼、锰或铬等) 淬火并回火 0.50 0.28 0.05 0.05
450 合金钢d,f 淬火并回火 0.50 0.30 0.05 0.05
①, 不允许表面硬化。
②, 有争议时,实施成品分析。
③, c. 可以使用易切钢,其铅、磷和硫的最大含量分别为 0.35%、0.11%、0.34%。
④, d. 可以使用最大含铅量为 0.35% 的钢。
⑤, e. 仅适用于 d≤M16。
⑥, f. 这些合金钢至少应含有下列的一种元素,其最小含量分别为铬 0.30%、镍 0.30%、钼 0.20%、钒 0.10%。当含有二、三或四种复合的合金成分时,合金元素的含量不能少于单个合金元素含量总和的 70%。
硬度等级
Hardness Classess
维氏硬度 HV10 / 最小值 维氏硬度 HV10 / 最大值 布氏硬度 HBW F=30D² 最小值 布氏硬度 HBW F=30D² 最大值 洛氏硬度 HRB 最小值 洛氏硬度 HRB 最大值 洛氏硬度 HRC 最小值 洛氏硬度 HRC 最大值 螺纹未脱碳层的高度 E/mm 最小值 螺纹全脱碳层的高度 G/mm 最大值 表面硬度 HV0.3 最大值 无增碳 HV0.3 最大值
14H
22H
33H
45H
140 290 133 276 75 105 - - - - - -
220 300 209 285 95 a a 30 1/2 H₁ 0.015 320 c
330 440 314 418 - - 33 44 2/3 H₁ 0.015 450 c
450 560 428 532 - - 45 53 3/4 H₁ b 580 c
①, a. 对 22H 级如进行洛氏硬度试验时,需要采用HRB试验最小值和HRC试验最大值。
②, b. 对 45H 不允许有全脱碳层。
③, c. 当采用 HV0.3 测定表面硬度及芯部硬度时,紧固件的表面硬度不应比芯部硬度高出 30HV 单位。
Alternative history GB /T 3098.3 - 2000 GB /T 3098.3 - 2016

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