High strength low alloy plate: 
 Q345A (16Mn), Q390A (15MnV), Q420A (15MnVN), S420N, Q460C, S460N, A572Gr50, SM490B, St52-3, S275JR, S355JR, WH60A, WH70B, A709Gr50, BB41BF, CortenB, SHT60, A633D, A633E, SM520 , SM570, Q550CFC, StE355, StE460, A588GrB, S275JO, S275J2, S355J2, S275NL, S355J0, S355K2, S355NL, NR400ZL, 

 Implementation of standards: 
 Special conditions of GM1591 GB/T1591 JIS G 3106 JIS G 3101 GB/T16270 JIS G 3106 JIS G 3101 DIN17100 DIN17102 ASTM EN10025 EN10113 BS4360 ISO4590-2 ISO630 

 Main purposes: 
 Manufacturing plant, general building and construction machinery, such as mines and various types of engineering, construction rig, shovel, electric wheel dump trucks, mining vehicles, excavators, loaders, bulldozers, various types of cranes, coal mine hydraulic support, etc. machinery and equipment and other structural parts. 

 Low alloy steel (also known as ordinary low-alloy steel, HSLA) 
 (1) the use is mainly used in the manufacture of bridges, ships, vehicles, boilers, pressure vessels, pipelines, large steel structure and so on. Performance requirements of high intensity (1): in general the yield strength of 300MPa above. (2) high toughness: the extension rate of 15% to 20%, at room temperature impact toughness is greater than 600kJ / m ~ 800kJ / m. For large welded components, but also have a higher fracture toughness. (3) good weldability and cold formability. (4) cold-brittle transition temperature. (5), good corrosion resistance. (3) Ingredient (1) low carbon: toughness, weldability and cold formability requirements, the carbon content of no more than 0.20%. (2) by adding the manganese-based alloy elements. (3) by adding niobium, titanium or vanadium and other accessories plus elements: a small amount of niobium, titanium or vanadium in steels form carbides or carbonitrides, small ferrite grain and improve the strength and toughness of the steel . In addition, a small amount of copper (≤ 0.4%) and phosphorus (0.1%), etc., can improve the corrosion resistance. Adding a small amount of rare earth elements can desulfurization, degassing steel purification, improved toughness and process performance. 4 commonly used in low-alloy structural steel 16Mn is the largest amount of China's low-alloy high-strength steel, the largest steel production. State organizations to fine-grained ferrite - pearlite strength than ordinary carbon steel Q235 is about 20% to 30%, atmospheric corrosion by 20% to 38%. 15MnVN middle-level strength steel used in most steel. Higher strength and toughness, weldability and low temperature toughness is also good, are widely used in the manufacture of bridges, boilers, ships and other large structures. Intensity level of more than 500MPa, the ferrite and pearlite difficult to meet the requirements, so the development of a low-carbon bainitic steel. By adding Cr, Mo, Mn, B, and other elements, air-cooled conditions bainite, so the higher strength, ductility, welding performance is also good, and more for high-pressure boiler, high pressure container. (5) heat treatment characteristics of this type of steel is generally used in hot-rolled air-cooled state does not require special heat treatment. Microstructure generally use ferrite + sorbite. 
 1, the range of specifications: thickness 8-650mm, width 1500-4020mm, length 3000mm-18800mm. 
 Status: hot-rolled, controlled rolling, normalizing, tempering, normalizing and tempering, quenching and tempering. 
 The implementation of standards: International, the rule of standard, the United States the ASME, ASTM, Japanese JIS, German DIN, French NF, British BS, European EN, the international ISO standards. 
 Produce level: A, B, C, D and E and the thickness direction performance of the Z15, Z25, Z35. 
 5, the implementation of testing standards: China (with JB4730, GB/T2970), the United States of America (A435, A577, A578), Japan (JIS GO801, JISGO901), Germany (SEL072), the United Kingdom (BS5996), France (NFA04-305). 
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