1. after Ultrasonic test under standard GB/T6402-1991
2. black or machined surface
3. good quality
4. enough stock at hand
1.Dimentions of all 4140/4142/42CrMo4/42CrMo products in our company(Unit:MM)
| round bar(HR) | dia 10--65 (length 2000-5000) |
| round bar(HF) | dia70--500(length2000-5000) |
| flat(HR) | thickness*width*length 10--90*205--605*2000--4000 |
| flat(HF) | thickness*width*length 25--1000*205-1000*2000-4000 |
| die block | as per customers' required dimention and hardness(provide heat treatment service) |
2. Standard:AISI 4140/4142,DIN 41CrMo4/42CrMo4,JIS SCM4,ISO 683/1 3,BS708M40/708A42/709M40,W.Nr.1.7225
3.Application
• Shafts, gears, cylinders and columns for industry mechanics in general.
• Construction of mold
• For compression molds, where the etching is not required.
• Mechanical parts in general.
4.Steel Feature
• Good purity and homogeneity.
• Good machinability
(Roughing, grinding and drilling).
• Good dimensional stability during heat treatment.
• Excellent preparation for nitriding, both ionic and gaseous, induction hardening to increase the mechanical properties.
• Poor solderability
5.Heat Treatment
Normalization: heating to 840 to 880 ° C, maintenance, furnace cooling to 600 ° C, then in air.
Stress relieving: after rough heat to 500 ° C,
maintenance raff. In oven to 400 ° C, then in air.
Hardening: preheating from 600 to 650 ° C austenitizing
at 840 to 880 ° C, quenching in oil.
Tempering: heating to 550 - 650 ° C and maintenance regime, again depending on the mechanical properties
to be obtain
