Title: General Technical Requirements of Heat Document No.: Rev: A Treatment Effective Date: 热处理通用技术要求热处理通用技术要求热处理通用技术要求热处理通用技术要求 Originator.: 姚富海姚富海姚富海姚富海 Page 1 of 8 Work Instruction 1.0 General / 总则 This document specifies requirements for steel parts heat treatment of Machine Shop, in order to a) provide criterions for heat treatment technique making。 b) clarify heat treatment quality control requirements and inspection standard。 规范五金部钢铁零件热处理技术要求，为热处理工艺制订提供依据，明晰热处理质量控制 要求及检验标准。 2.0 Application / 適用範圍適用範圍適用範圍適用範圍 This technical requirement is applicable to steel parts heat treatment in Machine Shop. 本技术要求适用于五金厂钢铁零件的热处理。 3.0 Terms and Definitions / 定義定義定義定義 3.1 QA- Quality Assurance 品质保证部 3.2 PIE- Production & Industrial Engineering 产品和工业工程部 4.0 Responsibility / 職責職責職責職責 4.1 Material Team in Engineering Department is responsible for assessing the feasibility of heat treatment technical requirements. 工程部材料组负责评估热处理技术要求的可行性。 4.2 PIE is responsible for making& changing of heat treatment technical requirements, according to products characteristics and customers requirements. PIE 依据产品特性及客户要求，制订及变更热处理技术要求； 4.3 QA is responsible for monitoring heat treatment quality, making inspection instruction according to technical requirement. QA 负责热处理质量监控，按技术要求制订检验规范。 5.0 Procedure / 程序程序程序程序 5.1 General 总则 General heat treatment technical requirements shall include: 热处理通用技术要求应包括： （1）Appearance requirement 外观要求 （2）Hardness 硬度 （3）Case harden depth 硬化层深度 Title: General Technical Requirements of Heat Document No.: Rev: A Treatment Effective Date: 热处理通用技术要求热处理通用技术要求热处理通用技术要求热处理通用技术要求 Originator.: 姚富海姚富海姚富海姚富海 Page 2 of 8 Work Instruction （4）Metallographic microstructure 金相组织 （5）Permissible deformation tolerance of heat treatment 热处理允许畸变量 5.2 Quenching and tempering 淬火及回火 5.2.1 Appearance requirement 外观要求 Surface of parts must be free of defeats as crack, scratch, and oxide scale. 工件表面不允许有裂纹、伤痕、氧化皮等缺陷。 5.2.2 Surface hardness 表面硬度 Surface Hardness value must be in spec. specified by technical requirement. Location of determining core hardness and surface hardness shall be defined in technical requirement. The permissible surface hardness variation shall not exceed the limit stated in table 1 表面硬度必须满足技术要求。 技术要求中应标明心部硬度及表面硬度的检测位置。 表面硬度 的偏差不能超过表 1 规定。 single part 单件 same lot 同一批件 Hardness range 硬度范围 HRC 50 50 Permissible variation 硬度偏差 4 4 4 7 6 6 Table 1 Permissible surface hardness variation of quenching, tempering steel parts 表 1 淬、回火件的表面硬度允许偏差 HRC 5.2.3 Metallographic microstructure 金相组织 (1)For medium carbon steel and alloy steel it shall obtain martensite, with acceptable martensite grade between 2 to 4, and with microstructure of plate martensite + fine needle martensite. 中碳钢和中碳合金钢淬火后应得到马氏体。马氏体等级控制在 24 级，组织为板条马氏体 +细针马氏体。 (2)For high carbon tool steel and high carbon low alloy tool steel, the quenching microstructures are homogeneous un-dissolved carbide, and thin grain martensite. 高碳工具钢和高碳低合金工具钢淬火组织为均匀分布的未溶碳化物+隐晶马氏体。 5.2.4 Deformation tolerance 允许畸变量 The bending in 1 meter of length after quenching and tempering shall not exceed 0.5mm. 淬、回火件每米允许弯曲的最大值，为 0.5mm。 Title: General Technical Requirements of Heat Document No.: Rev: A Treatment Effective Date: 热处理通用技术要求热处理通用技术要求热处理通用技术要求热处理通用技术要求 Originator.: 姚富海姚富海姚富海姚富海 Page 3 of 8 Work Instruction 5.3 Induction hardening and tempering 感应淬火与回火 5.3.1 Appearance requirement 外观要求 Surface of parts must be free of defeats as quenching crack, scratch, and rust layer. 工件表面不能有淬火裂纹、锈蚀和伤痕等缺陷。 5.3.2 Surface Hardness 表面硬度 Surface hardness value must be in spec. specified by technical requirement. The permissible surface hardness variation shall not exceed the limit stated in table2. 硬度必须满足技术要求。表面硬度的偏差不能超过表 2 规定。 single part 单件 same lot 同一批件 Hardness range 硬度范围 HRC 50 5060 60 50 5060 60 Permissible variation 硬度偏差 5 4.5 4 6 5.5 5 Table 2 Permissible surface hardness variation of induction quenching, tempering steel parts 表 2 感应淬火回火件的表面硬度允许偏差 HRC 5.3.3 Effective case harden depth 有效硬化层深度 Effective case harden depth is defined by perpendicular distance between the surface and the layer having a hardness of 0.8*HVms (HVms is minimum surface hardness of spec). The permissible effective case harden depth variation shall not exceed the limit stated in table 3. 有效硬化层深度是指当硬度为 0.8*HVms 处时与表面的垂直距离 （HVms 为要求的最低表面 硬度）。其偏差范围不超过表 3 规定。 Effective case harden depth 有效硬化层深度 Permissible variation 硬化层深度偏差范围 mm single part 单件 same lot 同一批件 1.5 0.2 0.4 1.52.5 0.4 0.6 2.53.5 0.6 0.8 3.55 0.8 1.0 Table 3 Permissible effective case harden depth variation of induction hardening 表 3. 感应加热表面淬火硬化层深度偏差范围 Title: General Technical Requirements of Heat Document No.: Rev: A Treatment Effective Date: 热处理通用技术要求热处理通用技术要求热处理通用技术要求热处理通用技术要求 Originator.: 姚富海姚富海姚富海姚富海 Page 4 of 8 Work Instruction 5.3.4 Metallographic microstructure 金相组织 For medium carbon steel and alloy steel it shall obtain martensite after induction hardening, with acceptable martensite grade between 4 to 6. 中碳结构钢和中碳合金结构钢感应加热表面淬