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Grade 420J2, martensitic stainless steel

420J2 Stainless Steel Coil and Sheet

A martensitic stainless steel with more carbon than 420J1, 0.26–0.40%. That gives greater hardness and strength after heat treatment, for parts that need high wear resistance and moderate corrosion resistance.
Tell us about your projectSee sizes
Forms
Coil, sheet
Thickness
0.15–3.0 mm
Hardness
HRC 52–55 after heat treatment
Standards
JIS G4303, G4304, G4305

Is Sanmei Metal the right supplier for you?

We supply stainless steel together with the processing and technical support that projects and products need.

A good fit if you

Need a specific grade, finish or size for a project, from samples or one coil to a few containers
Want it slit, cut to size or fabricated to your drawing
Need documents: a Mill Test Report with every order, SGS testing on request
Want help choosing the right grade and finish for your application
Build products or projects: equipment housings, architectural interiors, elevator and kitchen work

When buying direct from a mill may suit you better

You need standard grades in full-mill quantities and compare on price per tonne
Not sure which applies to you? Tell us about your order and we will give you our professional advice.
Tell us about your projectSee what we fabricate

Sizes we supply in 420J2.

Standard widths from stock, cut-to-length sheet, and custom slitting for strip-fed production lines.

420J2 coil

Width
1000, 1219, 1240, 1500 mm, or slit to your width
Thickness
0.15–3.0 mm
Coil weight
3–10 t

420J2 sheet

Width
1000, 1219, 1240, 1500 mm, or cut to size
Length
2000, 2438, 2500, 3000, 3048 mm
Thickness
0.3–3.0 mm
Every order ships with a Mill Test Report. Sample sheets and small batches are welcome. Standard mill finish: 2B finish.
Get a quote for 420J2Send a cut list or drawing

What 420J2 is, and where it is used.

A magnetic, hardenable steel for blades and tools.

General properties

Carbon 0.26–0.40% and chromium 12.0–14.0%, with smaller amounts of other elements. Magnetic, and hardens to HRC 52–55 after heat treatment.

Applications

Diving knives, kitchen knives, surgical instruments, hand tools, pump shafts, swords and daggers, for its hardness and durability.

Standards

JIS G4303 for bars, JIS G4304 for hot-rolled plate, sheet and strip, and JIS G4305 for cold-rolled plate, sheet and strip.
Tell us what the part is, where it will be used and roughly how many. We confirm the grade and finish before you order.
Tell us your application

Corrosion and heat resistance.

Good in mild and domestic environments, limited at temperature extremes.

Corrosion resistance

Good in mild atmospheres and domestic environments
Resists diluted nitric acid, carbonic acid and ammonia
Resists crude oil, several petroleum products and steam
Resists detergent solutions, vinegar and food acids

Heat resistance

Good corrosion resistance at room temperature
Loses ductility at sub-zero temperatures
Loses strength at elevated temperatures through over-tempering
Tell us what the part is, where it will be used and roughly how many. We confirm the grade and finish before you order.
Tell us your application

Processing 420J2.

Machine it soft, then harden and temper.

Machining

Easy to machine when annealed; harder to machine once hardened.

Welding

Possible, but avoid welding in the annealed, hardened or tempered condition to prevent brittleness and cold cracking. Preheat, control interpass temperature, cool very slowly and anneal after welding.

Hot working

Improves toughness and wear resistance.

Cold working

Increases hardness and strength, and improves surface quality and dimensional accuracy.

Annealing

Heat uniformly to 840–900 °C (1544–1652 °F) and hold until the section is uniform, then soak and cool.

Hardening

Heat to 950–1020 °C (1742–1868 °F), hold until uniform, then quench in oil or cool in air.

Tempering

Reduces brittleness and internal stress after hardening.

Hardness after treatment

HRC 52–55.
Have a drawing, cut list or sample photo? Upload it and we review it and send you a quote.
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420J2 physical and mechanical properties.

Typical physical values, and minimum mechanical values in the quenched and tempered condition. Coil and sheet are supplied annealed for forming and machining.

Physical properties

Property
Value
Density
7.75 g/cm³
Modulus of elasticity
29 × 10⁶ psi
Thermal expansion, 0–100 °C
10.4 µm/m·°C (5.8 × 10⁻⁶ /°F)
Thermal conductivity
24.9 W/m·K
Specific heat
0.11 Btu/lb·°F
Electrical resistivity
56 µΩ·cm

Mechanical properties, quenched and tempered (JIS G4303)

Property
Value
Yield strength, min.
540 N/mm²
Tensile strength, min.
735 N/mm²
Elongation, min.
12%
Hardness after hardening
HRC 52–55

Chemical composition, % by weight

Grade
C
Si
Mn
P
S
Cr
Ni
420J2
0.26–0.40
≤1.00
≤1.00
≤0.040
≤0.030
12.00–14.00
≤0.60
Tell us what the part is, where it will be used and roughly how many. We confirm the grade and finish before you order.
Tell us your application

Finishes and processing from Sanmei Metal.

Mill finishes, decorative finishes made in our own facility, and coil and sheet cut to your size.

Decorative finishes

Nickel Silver Hairline Stainless Steel Sheet S26HL-01 (3)
Hairline
Nickel Silver Satin Stianless Steel Sheet S26ST-01 (3)
Satin
black mirror polised stainless steel
Mirror
Nickel Silver Vibration Stainless Steel Sheet S26VB-01 (2)
Vibration
See all decorative finishes →

Mill finishes

Processing

Precision slitting
Cut to length
Shearing
Edge trimming
Blanking
Surface polishing
Tell us about your projectSend a sample photo or drawing

420, 420J1 and 420J2.

420J1 and 420J2 are branches of 420, made to meet different needs for hardness, strength and corrosion resistance. Adjusting the composition, above all the carbon, gives steels for different uses.
Tell us what the part is, where it will be used and roughly how many. We confirm the grade and finish before you order.
Tell us your application

420J2 stainless steel FAQ.

Questions buyers ask before ordering 420J2.

What is the difference between 420J1 and 420J2?

420J2 has more carbon, 0.26–0.40%, so it reaches greater hardness and strength after heat treatment.

Is 420J2 magnetic?

Yes. It is a martensitic stainless steel and it is magnetic.

How hard can 420J2 get?

HRC 52–55 after heat treatment: heat to 950–1020 °C, quench in oil or cool in air, then temper.

Can 420J2 be welded?

Yes, with care. Avoid welding in the annealed, hardened or tempered condition; preheat, control interpass temperature, cool very slowly and anneal after welding to prevent cracking.

What sizes do you supply?

Coil in 1000, 1219, 1240 and 1500 mm widths or slit to size, 0.15–3.0 mm thick. Sheet in the same widths, 2000 to 3048 mm long, 0.3–3.0 mm thick.
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Contact us

Creating Center, Shunde District, Foshan City, Guangdong Province, 528315, China
+8615015653566 / 0757-87668353
Paige Deng
marketing@sanmeimetal.com

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    TEL: +8615015653566 / 0757-87668353
    Email: marketing@sanmeimetal.com

    Headquarters:
    Creating Center, No.142, Yuhe Road, Lecong Town, Shunde District, Foshan City, Guangdong Province, China. 528315

    Factory: Liyuan Logistics City, Chencun Town, Shunde District, Foshan City, Guangdong Province, China. 528313

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