Supply of SUS416 stainless steel, SUS420 stainless steel 
 Alloy quenched and tempered structural steel is generally divided into surface hardened structural steel and structural steel. 
 ① quenched and tempered structural steel the carbon content of the general type of steel is about 0.25% to 0.55%, for the given section size of the structural parts, in the quenched (quenching and tempering), if the cross-section along the hardenability, the mechanical properties good, if not through the quenching, the microstructure occurs in the free ferrite, the toughness decreased. Has a tendency to temper brittleness of steel, such as manganese, chromium steel, nickel chromium steel, tempering the cold soon after. Such critical diameter of steel quenching, with the grain size and content of alloying elements increases, for example, 40Cr steel and 35SiMn about 30 ~ 40mm, and 40CrNiMo and 30CrNi2MoV steel is about 60 ~ 100mm, commonly used in the manufacturing tolerance more 20CrMnSi 25CrMnSi 30CrMnSi 35CrMnSi 

 30CrMnTi 5CrMnMo 15CrMnMo 15CrMnMoA 20CrMnMo 20CrMnMoA 25CrMnMo 25CrMnMoA 30CrMnMo 30CrMnMoA 35CrMnMo 35CrMnMoA 40CrMnMo 40CrMnMoA 50CrMnMo 50CrMnMoA 12CrMo 15CrMo 15CrMoA 15CrMoH 20CrMo 20CrMoA 20CrMoH 25CrMo 25CrMoH 25CrMoV 30CrMo 30CrMoA 30CrMoH 35CrMo 35CrMoA 35CrMoH 40CrMo 40CrMoA 42CrMo 40CrMoH 42CrMoA 25CrMo4 34CrMo4 42CrMo4 50CrMo4 15CrMo5 20CrMo5 40CrMo5 CrMoV 12CrMoV 12CrMo1V1 24CrMoV 35CrMoV 15CrNiMo 15CrNiMoA 20CrNiMo 20CrNiMoA 30CrNiMo 30CrNiMoA 35CrNiMo 35CrNiMoA 40CrNiMo 40CrNiMoA 42CrNiMo 42CrNiMoA 
 Alloy structural steel (101) 16Mn 15MnV 09MnNiD 15MnVB 16MnD 16MnR SA333Gr1 (LF2) SA333Gr3 (LF3) 50Mn2 30Mn2 20SiMn 35SiMn 40MnB 35VB 40MnVB 20MnMo (A) 18MnMoNb 20MnMoNb 20Cr 40Cr (A) 38Cr (A) 12CrMo 12Cr2Mo 12Cr2Mo1 15CrMo (A) 15Cr2Mo1 (A) 25CrMo 30CrMo (A) 34CrMo1 (A) 35CrMo (A) 42CrMo (A) 48CrMo (A) 12CrMoV 12Cr1MoV 24CrMoV 35CrMoV (A) 20Cr1Mo1V 25Cr2MoV (A) 25Cr2Mo1V (A) 30Cr2MoV 30Cr1Mo1V 38CrMoAL (A) 20Cr3MoWV (A ) 15CrMn 20CrMnSi (A) 30CrMnSiA 35CrMnSi (A) 20CrMnMo 40CrMnMo (A) 20CrMnTi 30CrMnTi 13Ni5 (A) 12CrNi3 12Cr2Ni4 (A) 20Ni4Mo 20Cr2Ni4 (A) 40CrNi 15CrNiMo 20CrNiMo (A) 25CrNiMo 30Cr2Ni2Mo 40CrNiMo (A) 15NiCuMoNb5 15CrNi4Mo (A) 18CrNiMnMoV 18Cr2Ni4W (A) 34CrNi1Mo 34CrNi3Mo (A) 25Cr2Ni4MoV 37CrNi3MoV PCrNi3MoV 38CrNi2MoV 20Cr1Mo1VNbTiB 50CrNiMoV 10Cr9Mo1VNb (T91) 35Cr2Ni2Mo large load shaft, connecting rod and other structural parts. ② surface hardened structural steel for the manufacture of hard wear-resistant surface and the heart of the Ministry of flexible parts such as gears, shafts, etc. Department of toughness to make parts heart high carbon steel should be low, generally in the 0.12 to 0.25%, as well as the right amount of alloying elements, in order to ensure appropriate hardenability. Nitriding of steel need to join and easy to form nitrides of alloying elements (such as Al, Cr, Mo, etc.). Carburizing or carbonitriding steel, the 850 ~ 950 ℃ after carburizing or carbonitriding, quenching and tempering at low temperatures (about 200 ℃) state to use. Nitrided steel after nitriding (480 ~ 580 ℃), the direct use, is no longer quenched and tempered.