定价： 3038元 / 折扣价： 2704 元 加购物车

定价： 358元 / 折扣价： 319 元 加购物车

定价： 1290元 / 折扣价： 1149 元 加购物车

定价： 541元 / 折扣价： 482 元 加购物车

定价： 1099元 / 折扣价： 979 元 加购物车

定价： 541元 / 折扣价： 482 元 加购物车

定价： 358元 / 折扣价： 319 元 加购物车

This specification covers standard specification for alloy steel bars, suitable for surface hardening by nitriding, designated as Classes A, B, C, and D. Class A and Class D bars are general-purpose bars; Class B bars are free-machining bars; Class C bars contain nickel and are characterized by higher core strength. All classes shall be furnished in the hot-rolled, quenched, and tempered condition. The steel shall be made by the electric-furnace process only. The microstructure resulting from heat treatment shall not show free ferrite in amounts exceeding the prescribed values. The maximum depth of total and partial decarburization of hot-rolled bars and heat-treated bars shall not exceed the amounts prescribed. Heat or cast analysis shall be performed on four classes of steel, wherein the material shall conform to the required chemical composition for carbon, manganese, phosphorus, sulfur, silicon, chromium, aluminum, molybdenum, selenium, and nickel. After quenching and tempering, the steel shall conform to one of the specified hardness ranges.1.1 This specification covers alloy steel bars, suitable for surface hardening by nitriding, designated as Classes A, B, C, and D. Class A and Class D bars are general-purpose bars; Class B bars are free-machining bars; Class C bars contain 3.50 % nickel and are characterized by higher core strength. All classes are normally furnished in the hot-rolled, quenched, and tempered condition. However, centerless-ground or turned bars, in any of the classes, may be specified by the purchaser. Also, as-rolled, annealed, or unannealed bars suitable for forging may be purchased to this specification. When as-rolled, annealed, or unannealed bars are furnished, Sections 6, 10, and 11 are not applicable.1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 515元 加购物车

This specification covers hot-finished or cold-finished plate, sheet, and strip in the more commonly used types of stainless free machining steels designed especially for optimum machinability and for general corrosion and high temperature service. Stainless and heat-resisting plate, sheet, and strip, are covered in separated specifications. The steel shall be made by one or more of the following processes: electric-arc, electric-induction, or other suitable commercial processes. The chemical composition shall conform to the requirements specified. Hardness test shall conform to the hardness requirements specified.1.1 This specification covers hot-finished or cold-finished plate, sheet, and strip in the more commonly used types of stainless free machining steels designed especially for optimum machinability and for general corrosion and high temperature service. Stainless and heat-resisting plate, sheet, and strip, other than free-machining types, are covered in separate specifications.1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 515元 加购物车

定价： 515元 加购物车

定价： 21元 / 折扣价： 18 元 加购物车

定价： 19元 / 折扣价： 17 元 加购物车

本标准规定了煅烧α型氧化铝产品的要求、试验方法、检验规则及标志、包装、运输、贮存、订货单（或合同）内容。
本标准适用于以氢氧化铝或氧化铝为原料，在适当的温度下煅烧成晶型稳定的α型氧化铝产品。主要用于制作耐火材料、氧化铝陶瓷以及抛光研磨剂等产品。

定价： 16元 / 折扣价： 14 元 加购物车

定价： 515元 加购物车

定价： 541元 / 折扣价： 482 元 加购物车