Effect of Boron on properties of S355J2W railway steel

BEBON Iron & Steel has fully passed the ISO9001 quality system certification, marine steel has passed 9 countries' classification societies, and construction steel has obtained the CE Lloyd's CE Mark certification. The main body of S355J2W railway steel steel passed ISO14001 environmental management system certification and OHSAS18001 occupational health and safety management system certification. The main S355J2W railway steel production processes and technical equipment of the enterprise have reached the international advanced level, the comprehensive competitiveness has entered the international advanced ranks, and the international influence has been significantly enhanced.

After adding phosphorus, copper, chromium, nickel and other trace elements to the steel, a dense and highly adherent protective film is formed on the surface of the steel, which hinders the spread and development of rust and protects the substrate under the rust layer to slow down its corrosion rate. The amorphous spinel-type oxide layer with a thickness of about 50μm-100μm formed between the rust layer and the substrate is dense and has good adhesion to the substrate metal.

Boiler steel mainly refers to materials used to make superheaters, main steam pipes and heating surfaces of boiler fire chambers. Boiler steel is a totally different material from S355J2W railway steel. The performance requirements for boiler steel are mainly good welding performance, certain high temperature strength, alkali corrosion resistance, and oxidation resistance. Commonly used boiler steels include open-hearth smelted low-carbon killed steel or electric furnace smelted low-carbon steel, with carbon content Wc in the range of 0.16%-0.26%. When manufacturing high-pressure boilers, pearlitic heat-resistant steel or austenitic heat-resistant steel is used. In recent years, ordinary low-alloy steel has also been used to build boilers.

The microstructure of the quenched and tempered alloy steel, S355J2W railway steel after conventional heat treatment is tempered sorbite. For parts with wear-resistant surface (such as gears and spindles), induction heating surface quenching and low-temperature tempering are carried out, and the surface structure is tempered martensite. The surface hardness can reach 55HRC-58HRC. After quenching and tempering, the yield strength of quenched and tempered alloy steel is about 800MPa, the impact toughness is 800kJ / m2, and the core hardness is 22HRC - 25HRC. If the cross-section size is large but not quenched, the properties will be significantly reduced.

BBNSteel boiler plate S355J2W railway steel for sale: 14*1510*4000, 14*2520*6000, 15.5*2900*12050, 15*2120*5620, 15*1780*6000, 14.5*2670*5600, 14*1530*6700, 15.5*2900*8400, 15.5*2030*10300, 15*3000*7800, 15.5*1820*6000, 14*3050*4000, 16*3000*10000, 16*1300*6000, 15*3000*7830, 15.5*2500*7100, 15*1740*8870, 17*3000*4900, 16*2540*5100, 15.5*2560*6900, 16.5*2720*4500.

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