420 420 j1 / j2 stainless steel / 420 f has a certain wear resistance and corrosion resistance, high hardness, its price is lower in the stainless steel ball, applies to stainless steel general requirements of the work environment. Suitable for all kinds of precision machinery, bearings, electrical, equipment, instruments, meters, transportation tools, household appliances, etc. More used in the manufacture of the air, steam, water and oxidation resistance acid corrosion parts. 420 j1: stainless steel after quenching hardness, good corrosion resistance (magnetic) 420 j2 stainless steel after quenching, higher than 420 j1 steel hardness (magnetic).
420 j2 and 3 cr13 steel is martensite stainless steel body, after quenching tempering is used. As opposed to a 1 cr13, 2 cr13 steel, has a higher strength, hardness and hardenability, but its corrosion resistance and thermal stability under 700 ℃ lower than 1 cr13, 2 cr13 steel. Cold working property and welding performance is bad, should immediately after welding heat treatment, to prevent cracking. In the annealed state has good machinability.
Chemical composition
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The element
C
Mn
Si
Cr
Ni
s.
P
Content %
0.26 ~ 0.35
1 or less
1 or less
12.00 ~ 14.00
0.60 or less
0.030 or less
0.035 or less
Heat treatment
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Bar and forgings: 1000 ~ 1050 ℃ oil quenching or empty cold, 200 ~ 300 ℃ tempering. Plate: 740 ~ 780 ℃ annealing or high temperature tempering.
Melting and casting process: available electric arc furnace, electric arc furnace + esr method such as smelting.
Under the heat treatment of hardness
Heat treatment system
HRC
HRB
HB Kgf/was
870 ~ 900 ℃
--
81
155 ~ 180
760 ℃ intermediate annealing, air cooling
--
80 ~ 92
205 ~ 225
980 ~ 1050 ℃ cold oil
53 ~ 56
--
530 ~ 560
980 ~ 1050 ℃ oil quenching + 150 ~ 370 ℃ tempering
48-53
--
470 ~ 530
Antioxidant performance: under 700 ℃ has the stable oxidation resistance.
Process performance
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1. The thermal pressure processing technology parameters
appreciation
Start temperature ℃
End temperature ℃
cooling
Before the furnace charging acuities were 800 ℃, 850 ℃ heating slowly
1160-1160.
> 850
Slow cooling and annealing in time
2. Poor cold deformation properties of the steel
3. Poor welding performance, such as parts must be welding, shall be immediately after welding heat treatment
4 parts heat.