Aisi 2B BA No.4 Finish 420 J2 Stainless Steel Sheet with Stock

Aisi 2B BA No.4 Finish 420 J2 Stainless Steel Sheet with Stock

420 J2 stainless steel The carbon content of 420 series steel is lower than 0.35; so the hardness after heat treatment is HRc52-55; but the performances including loss resistance aspects are not very outstanding. Due to its easy cutting and grinding, it is suitable for factory manufacturing...
Product description

420 J2 Stainless Steel

The carbon content of 420 series steel is lower than 0.35; so the hardness after heat treatment is HRc52-55; but the performances including loss resistance aspects are not very outstanding. Due to its easy cutting and grinding, it is suitable for factory manufacturing cutting tools. Also because of the low carbon content and extreme excellent rust resistance , 420 stainless steel is therefore the ideal stainless steel for making diving knives.


 420J2 stainless steel sheet 1.jpg


Introduction

420J2/420J1/420F stainless steel has some certain wear resistance, corrosion resistance and high hardness. Its price is lower among the stainless steel ball, suitable for the working environment that have ordinary request. It is applicable to all kinds of precision machinery, bearings, electrics, equipment, instrument, meters, transportation, household appliances, etc.

 

Mostly used for manufacturing the components have resistance to corrosion from atmosphere, water steam, water and oxidizing acid. 420J1 stainless steel: high harness after quenching; good corrosion resistance(magnetic). After quenching, its hardness is more than 420J1. 420J2 is also called 3Cr13 stainless steel, the Martensitic stainless steel, using after quenching and tempering. Compared with 1Cr13, 2Cr13 stainless steel, 420J2 has higher strength, hardness and quenching degree. But its corrosion resistance and thermal stability below 700℃ is lower than those of 1Cr13, 2Cr13.

 

Cold workability and weldability are not good. The heat treatment should be done immediately after welding so as to prevent cracking. It has good machinability in the annealing condition.


420J2 stainless steel sheet 2.jpg

 

Chemical Composition

Element

C

Mn

Si

Cr

Ni

S

P

Content%

0.26~0.35

≤1

≤1

12.00~14.00

≤0.60

≤0.030

≤0.035

 

Heat Treatment

Bars and forging pieces: 1000~1050℃ oil quenching or air cooling; 200~300℃ tempering. Plate: 740~780℃ annealing or high temperature tempering.

 

Smelting and casting process: through arc furnace or arc furnace with electroslag remelting method.

 

Hardness Under Heat Treatment

Heat Treating

HRC

HRB

HB Kgf/mm2

870~900℃

--

81

155~180

760℃ intermediate annealing, air cooling

--

80~92

205~225

980~1050℃ oil cooling

53~56

--

530~560

980~1050℃ oil hardening+150~370℃ tempering

48-53

--

470~530

 

Oxidation Resistance: stable oxidation performance below 700℃.

 

420J2 stainless steel sheet 3.jpg


Processing Property

1. thermal pressure processing technique parameters

Revalue

Start temperature ℃

End temperature ℃

Cooling

Shove charge≤800℃, slow heating before850℃

1160-1200

>850

Slow cooling and timely annealing

 

2. The cold deformation property of steel is poor.

 

3. The welding performance is not good. If the parts must be welded, the heat treatment should be immediately made after welding.

 

4. Components treatment process, annealing process: 870-900℃ furnace cooling, also can use 730-780℃ air cooling.


Application Overview

Similar stainless steel grades are all developed in the world major industrial countries. The 3Cr13 stainless steel can be made for manufacturing the corrosion resistant, high strength, wear-resistant parts and measuring tools, medical apparatus, cutting tools, components, such as the springs working below 300℃, shaft, bolt, valves, bearings, etc. that working below 400℃. Crack is easy to occur when in rapid quenching, if through air cooling, the corrosion resistance will be reduced. Therefore, marquenching should be adopted for large load parts. Cold treatment should be done to reduce the remaining austenitic content in the organization.

 

Detailed requirement: this kind of steel should not be tempered at 350-550 ℃ temperature range.


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