Chemical Composition (in weight %)
Low alloyed cold working tool steel.
Cold rolls, back-up rolls, straightening rolls, non-ferrous 2 and 4
high roll mills.
Heat to 720-750oC, cool slowly in furnace. This will produce a maximum Brinell
hardness of 230.
Stress relieving to remove machining stresses should be carried out
by heating to approx. 650oC, holding for 1-2 hours at heat, followed by air cooling. This
operation is performed to reduce distortion during heat treatment.
Harden from a temperature of 800-820oC, 830-850oC followed by water or oil quenching. Hardness after quenching is
Tempering temperature: 200-600oC.
1.Inquiry with drawings in details.
2.Confirm steel material, chemical compositions, mechanical
3.Confirm payment terms,order materials or check material in stock.
4.Check material chemical compositions, material weight,
5.Cut materials record weight, making mould for casting of
pr-hearting for forging.
6.Forging ratios, heat treatment ,dimension check.
7.Rough machining, UT test,heat treatment.
8.Fine machining, UT test, dimension inspection, mechanical
9.Customer inspection, packing, delivery arrangement.
Steel ingot making
EAF+LF+VD/VAD or ESR
EAF + LF + VD+ Forging+ Normalizing & Tempering + Rough
machining + UT test + Quenching & Tempering + Precision
Chemical composition report, Physical properties report, Heat
treatment report, Dimensional inspection report, NDT report
Nondestructive test (NDT)
UT ( ultrasonic testing ), MT ( magnetic particle testing ), PT (
Quality certification : ISO 9001: 2008, IQNET