Detail of WJX(RZ)159-2005

Introduction of WJX(RZ)159-2005

Specification for supply of welded high strength structural steel HG785 焊接高强度结构用钢HG785供货技术条件 WJX (RZ) 159-2005 Name: welded high strength structural steel Designation: HG785 Delivery status: hot rolled This Specification replaces WJX (RZ) 159-2003 1. Scope of application This Specification is applicable to welded high strength structural steel with thickness of 5 ~ 16 mm. 2. Normative references GB 222 Method of sampling steel for determination of chemical composition and permissible variations for product analysis GB 223 Methods for chemical analysis of iron, steel and alloy GB 228 Metallic materials - Tensile testing GB 247 General rule of package, mark and certification for steel plates ( sheets) and strips GB 3274 Hot-rolled plates and strips of carbon structural steels and high strength low alloy structural steels JB 4159 Metal Charpy (V-notch) low temperature impact test method 3. Chemical composition The chemical composition of the steel shall meet the requirements of the table below: Designation Test items Expression of results Results or measured values Minimum Minimum HG785 C Si Mn P S Mo Cr Ni Nb B % % % % % % % % % % / 0.15 0.80 / / 0.10 0.10 / 0.02 / 0.15 0.40 2.00 0.030 0.015 0.60 0.60 0.80 0.08 0.005 Note: other minor alloying elements can be added if necessary. 4. Mechanical properties The mechanical properties of the steel shall be in accordance with those specified in the table below: Designation Test items Expression of results Results or measured values Minimum Minimum HG785D HG785E ReL Rm A50 180°cold bending Impact energy at -20℃ Impact energy at -40℃ MPa MPa % d=3a J J 685 785 15 Intact 40 27 / / / / / / Notes: 1) Sampling direction: transverse for tensile and cold bending samples, and longitudinal for impact samples; 2) Sampling position: 1/4 of the plate width. For steel plates with thickness ≥30mm, the center line of the sample is at 1/4 of the plate thickness, and there is no requirement for other plate thicknesses; 3) The impact energy and test temperature for Charpy (V-notch) impact test shall meet the requirements of the table above. The impact energy shall be calculated according to the arithmetic average of 3 specimens; it is acceptable that one of the specimen results is small, but shall not be less than 70% of the specified value; 4) There is no requirement for the impact energy of steel plates with thickness < 6mm. The impact specimen size of steel plate with thickness ≥ 6 ~ 7 mm is 5×10×55 (mm), that of steel plate with thickness ≥ 8 ~ 10 mm is 7.5×10×55 (mm), and that of steel plate with thickness ≥8~10mm is 10× 10× 55 (mm). For small size samples, the specified value of impact energy decreases proportionally.

Contents of WJX(RZ)159-2005