Advantages and disadvantages of hot rolling:

Advantages: IT CAN DESTROY THE CASTING STRUCTURE OF STEEL INgot, refine the GRAIN of steel, and eliminate the defects of microstructure, so that the steel structure is dense, and the mechanical properties are improved. The improvement is mainly reflected in the rolling direction, so that the steel is no longer isotropic to a certain extent. Bubbles, cracks and looseness formed during pouring can also be welded under high temperature and pressure.

Disadvantages:

1. After hot rolling, the non-metallic inclusions inside the steel (mainly sulfide and oxide, as well as silicate) are pressed into thin slices and layered (sandwich) phenomenon occurs. Delamination greatly deteriorates the tensile properties of the steel along the thickness and may cause interlaminar tearing when the weld seams contract. The local strain induced by weld shrinkage often reaches several times of the yield strain, which is much larger than the strain caused by load.

2. Residual stress caused by uneven cooling. The residual stress is the internal self-phase equilibrium stress without external force. All kinds of hot rolled steel sections have this kind of residual stress. Generally, the larger the section size of steel, the greater the residual stress. Although the residual stress is self-phase equilibrium, it has a certain influence on the properties of steel components under external force. Such as deformation, stability, fatigue resistance and other aspects may have adverse effects.

Number available：

JSH270C JSH270D JSH270E JSH310W JSH370W JSH400W JSH440R JSH440B JSH490W JSH490R JSH490BJSH540W JSH270C JSH270D JSH270E JSH310W JSH370W JSH400W JSH440W JSH440R JSH440B SAPH440BH

JSH490W JSH490R JSH490B JSH540W JSH540R JSH540Y JSH540B JSH590W JSH590R JSH590Y JSH780W JSH780R JSH780Y ZStE340 ZSTE380 ZSTE420 ZSTE460 JAC270C SPCC SPCC SPCD SPCE SPCEN SPFC340

SPFC340H SPFC370 SPFC390 SPFC440 SPFC490 SPFC540 SPFC590 SPFC590Y SPFC780 SPFC980 SS330 SS400 SPHC SPHD SPHE SAPH310 SAPH370 SAPH440 SPFH490 SPFH540 SPFH540Y SPFH590 SPFH590Y

SECC20/20 SECC20/20 SECD20/20 SECEN20/20 SEHC SEHD SEHE SEFC370~980Y SEPH310~440 SEFH490~540 SGC440F04 SA1C SP129 SP121 SP123SP124 SP131-340 SP132-340 SP135-340 SP131-370 SP132-370

SP150-390 SP152-440 SP150-490 SP150-540 SP151-590 SP153-590Z SP153-780 SP150-980 SP211 SP212 RP221 SP221 RP222 SP222 RP223 SP223  SP230-310 RP231-370 SP231-370 SP230-400 RP231-440

SP231-440F SP250-490 RP251-540 SP251-540 RP252-540 SP252-540F RP253-590 SP253-590 RP254-590 SP254-590 SP629 SP621 SP622 SP623 SP606 SP607 SP608 SP600-370~980 SP605-310~540 SP709 SP70

SP702 SP706 SP789 SP781 SP782 RP791 SP791 SP781-340 SP782-340 SP785-340 SP781-390 SP782-390 SP783 SP784 RP791-440 SP791-440 JAC270D JAC270E JAC270F JAC340W JAC340P JAC340H

JAC390W JAC390P JAC590R

Chemical composition and mechanical properties：

Want to know more brand chemical composition and mechanical properties, welcome to call.

The STEEL described provides stamping, swing shearing, leveling, laser cutting, laser welding and strip processing, and we also have a professional logistics team to provide you with a full range of services.

Let us know if you're interested.