Hot-rolled steel sheet / cold-rolled steel sheet: Steel ingots or slabs are difficult to deform at normal temperature and difficult to process. They need to be heated to 1100 ° C to 1250 ° C for rolling. This ASTM A709 bridge steel plate rolling process is called hot rolling. Rolling at room temperature is generally understood as cold rolling. However, from the point of view of metallurgy, the boundary between hot rolling and cold rolling should be distinguished by the temperature of metal recrystallization, that is, rolling below the recrystallization temperature is cold rolling; Rolling above the recrystallization temperature is hot rolling.
Hot Rolled Plates ASTM A709 bridge steel plate Machining After final forging/forming and Heat treatment process, all the pipe Fittings, Flanges, Fasteners, Etc. are sent for machining i.e. and preparation, O/D and I/D matching as per dimensional codes. An Expert Q.C. engineer is involved and he keeps constant vigil on every machining operation. Step machining is carried out as required by the codes. GO and NO-GO gauges are used to check the O/D & I/D of the fittings, Flanges, etc.
Customs statistics show that in the first two months of 2020 year, Tianjin's imports and exports to the EU, South Korea, Japan, the United States and other traditional trading partners declined, and imports and exports to ASEAN were 12.7 billion yuan, an increase of 7.8%, accounting for 12.8%. Among Tianjin's main trading partners, The only company that keeps growing is Tianjin's second largest trading partner. During the same period, Tianjin's imports and exports to the countries along the “Belt and Road” were 25.3 billion yuan, an increase of 6.2%, accounting for 25.5% of the city ’s total foreign trade import and export value, and an increase of 3.9% compared to the same period last year.
The effect of alloy elements on the properties of heat treatment methods for thick steel plate: the performance of heat treatment method reflects the difficulty coefficient level of heat treatment process and the tendency of defects caused by heat treatment process. The key points include cutting performance, over temperature sensitivity, quenching aging tendency and air oxidation carburizing tendency. ASTM A709 bridge steel plate, Carbon steel has high machinability, and slow cooling method can be used in heat treatment, which can reduce the deformation and cracking tendency of the products. The addition of Mn and Si will increase the over temperature sensitivity of steel.
