Standard responsible (department acronym, name)UTDH Markku BackholmSTD4153Quenching and tempering steels and precipitation hardening steels 淬火和回火调质钢和沉淀硬化钢 Contents 目录 Page页码Introduction介绍 2Changes from previous issue之前发行号的变化.21.Characteristics and applications特性及应用.21.1 Quenching and tempering steels淬火和回火调质钢.21.2 Precipitation hardening steels沉淀硬化钢.42.Macro inclusions宏观夹杂物.53.Austenite grain size奥氏体晶粒尺寸.54.Reduction factor折减系数.55.Requirements of hardenability可硬化行能力的要求.56.Chemical composition化学成分.66.1 Quenching and tempering steels淬火和回火调钢.6 6.2 Precipitation hardening steels沉淀硬化钢.87.Forms of supply供应形式.88.1 Mechanical properties力学特性.99.Precipitation hardening steels沉淀硬化钢.1610.Surface hardening表面硬化.1711. Fusion welding熔焊.1812.Forging temperature铸件温度.20 13.Heat treatment热处理.2114.Hardening of different steel grades不同级别钢的硬化. 2314.1 Hardening temperatures硬化温度.2414.2 Hardenability according to Jominy. 25根据顶端硬化性能力14.3 Tempering diagram回火图.3814.4 Diagram for isothermal transformation (TTT-diagram)等温转变图（TTT图）.54 15.Equivalent rectangular and circularsections for bars棒的等效矩形和圆形截面. 5916.Material indication on drawing材料显示在图纸上.6017.Appurtenant documents附属文件.62 Introduction简介Scania quenching and tempering steels and precipitation hardening steels deviate from standardized steels due to factors such as the requirements on macro inclusions, austenite grain size, reduction factor and forging temperature.Scania淬火和回火调质钢和沉淀硬化钢是偏离标准钢的，由于一些因素影响，比如说宏观夹杂物的要求、奥氏体晶粒尺寸，减少因素和锻造温度。Changes from previous issue 之前发行号的变化The standard has been revised and adapted to international standard when possible.Periodical up date.此标准已是修正版，通用于国际化标准，如有可能，也适用于定期更新的版本。1 .Characteristics and applications 特性及应用Basic data for heat treatment of steel grades according to this standard are given in section 13, “Heat treatment”and in section 14, “Hardening of different steel grade.根据本标准，钢级热处理的基本数据在第13节中，“热处理”在第14节中，“硬化有不同的钢级”。1.1Quenching and tempering steels 淬火和回火调质钢1.1.1 Conventional quenching and tempering steels常规的淬火和回火调质钢Steel 91672 is intended for quenching and tempering as well as surface hardening of relatively weak and simple parts. When surface hardening, a hardening depth of 4 mm can be achieved. The steel can be used in normalised or untreated condition. Steel 91672 replaces steel 1672.91672钢是用于淬火和回火，以及相对较弱和简单零件的表面硬化。当表面硬化时，硬化深度为4毫米，是可以达到的。钢适用于标准的或未经处理的条件下。钢91672替代1672钢。Steel 92220 can be used for medium sized parts where there are no requirements for total material hardening throughout. The steel is suitable for surface hardening. Steel 92220 replaces steel 2120. 92220钢可用于中等尺寸的零件，在整个材料硬化过程中没有任何要求。该钢是适用于表面硬化。92220钢替代2120钢。Steel 92254 has approximately the same strength properties as steel 92225, but it is cheaper due to a different chemical composition. The steel is suitable for surface hardening. 92254钢和92225钢有大致相同的强度性能，但由于不同的化学成分它更便宜。该钢适用于表面硬化。Steel 92245 has approximately the same strength properties as steel 92234, but it is cheaper due to a different chemical composition. The steel is suitable for surface hardening. 92245钢和92234钢有大致相同的强度性能，但由于不同的化学成分它更便宜。该钢适用于表面硬化。Steel 92225 is used when the material strength requirements are so high that a quenching and tempering steel need to be used, at the same time as there is a requirement for a certain degree of weldability. The steel is suitable for surface hardening. Steel 92225 replaces steel 2225. 92225钢需要在淬火和回火时使用，所以它的材料强度要求很高，同时也要有一定程度上的焊接要求。该钢是适用于表面硬化。92225钢替代2225钢。Steel 92234 is used for moderately loaded quenched and tempered parts in dimensions up to approximately 250 mm, to moderately- high loaded parts up to approximately 40 mm and highly loaded parts up to approximately 25 mm. The steel is suitable for surface hardening. Steel 92234 replaces steel 2234.92234钢是用于中等负载的淬火和回火零件，尺寸约为250毫米，至中度大约40毫米和高度负载部分高达约25毫米。该钢是适用于表面硬化。92234钢替代2234钢。 Steel 92244 is used for medium high loaded quenched and tempered parts in dimensions up to approximately 100 mm as well as for highly loaded parts up to approximately 25 mm. The steel is suitable for surface hardening. Steel 92244 replaces steel 2244.92244钢是用于中等高负载的淬火和回火零件，尺寸高达约100毫米，及高度负载部分高达约25毫米。该钢是适用于表面硬化。92244钢替代2244钢。 Steel 92541 is used for highly loaded quenched and tempered parts in dimensions up to approximately 250 mm as well as very highly loaded parts up to approximately 50 mm. The steel is less suited for surface hardening as water cooling of parts with complicated forms entails a certain risk of crack formation. Steel 92541 replaces steel 2541. 92541钢是用于高负载的淬火和回火零件，尺寸高达约250毫米，及非常高的负载部分高达约50毫米。该钢是不适合表面硬化的，由于零件具有复杂的冷却水冷却形式，且具有一定的裂缝形成的风险。92541钢替代钢2541。 Steel 92230 i