1.2083 | S136 | SUS420J2 | 4Cr13 | 420SS | 40X13 | X42Cr13 | M310

H10 (UNS T20810)

Premium air-hardening steel for aluminum die-casting dies requiring sustained thermal conductivity. Contains 3%Cr-2.5%Mo-V matrix maintains 500°C+ hardness (42-45HRC), excels in thermal fatigue resistance through cyclic heating. Ideal for cores/inserts in high-pressure casting (>800Bar). Requires double tempering at 540-580°C. 30% longer service life vs H13 in thin-wall molds.

1.2365 (DIN X37CrMoV5-1)

European hot-work standard for brass/copper alloy forging dies. 5%Cr-Mo-V composition achieves 52HRC after vacuum hardening, optimized for 600-650°C working range. Unique secondary hardening at 550°C enhances red hardness. Contains 0.08% sulfur for improved machinability pre-HT. Standard for automotive valve seat production tools.

4Cr3Mo3CrV (GB/T 1299)

Chinese-developed steel for zinc alloy injection molds. Triple hardening (Cr-Mo-V) system provides 48-51HRC with 0.25% lower carbon than H13 to prevent cracking in rapid-cycle operations. Special ESR refining ensures <15μm non-metallic inclusions. Dominates smartphone casing molds with 200K+ shot durability.

3X3M3Φ (GOST 5950)

Russian premium grade for glass molding tools. 3%Cr-3%Mo-3%W formulation withstands 750°C continuous contact with molten glass. Tungsten carbide network (12-15%) results in 62HRC surface hardness after nitriding. Mandatory for optical lens production molds in CIS markets.

X32CrMoV3-3 (AFNOR Z32CDV33)

French aerospace-grade steel for titanium superplastic forming (SPF) dies. Low-Si design (0.3%) prevents scale formation at 900°C argon environments. Maintains 35HRC at operating temps with 0.25%V microalloying. Certified for Airbus A350 wing panel tooling with 5-year guaranteed cycle life.

S136/SUS420J2 (AISI 420 Mod)

Corrosion-resistant martensitic steel for PVC/PP extrusion screws. 13%Cr-0.3%Mo composition with <0.03%S ensures acid resistance in plastic decomposition environments. Vacuum degassing achieves Ra0.1μm polishability. Standard in medical device molding requiring FDA-compliant surfaces.

4Cr13 (GB/T 1220)

Cost-effective Chinese alternative to 420SS for low-stress hot runners. Water-quench hardening to 48-50HRC with 0.8%Mn enhancing hardenability. Limited to <300°C applications but dominates small household appliance molds through 40% cost savings vs imported grades.

M310 (JIS G4404 SKD61 Mod)

Japanese-developed hybrid for large die-casting units (>3000T). Modified with 0.8%Ni for uniform hardening in 500mm+ sections. Triple-tempering process achieves <2HRC variance across 800×600mm blocks. Essential for automotive transmission housings with 1.5M+ shot requirements.

Chemical Composition

1.2083/S136/SUS420J2/4Cr13/420SS/40X13/X42Cr13/M310
Standard/Steel Grade		Chemical Composition(%)
		C	Si	Mn	Cr
DIN/W-Nr.	X42Cr13/1.2083	0.38~0.45	≤1.00	≤1.00	12.5~13.5
ASTM	420SS	0.30~0.40	≤1.00	≤1.25	12.0~14.0
JIS	SUS420J2	0.26~0.40	≤1.00	≤1.00	12.0~14.0

APPLICATION

1.2083 steel is mainly used in the production of PVC molds, wear-resistant and filling molds, including thermoset plastic molds and long-life molds.

420SS steel is suitable for manufacturing hot oil pumps, valve plates, valve bearings, medical instruments, springs, tools, nozzles, seats and other parts with high hardness and high wear resistance.

S136 die steel is often used in corrosion-resistant plastic material molds, electronic parts, discarded knives, tableware and so on.

Supply Form & Range

For 1.2083/S136/SUS420J2/4Cr13/420SS/40X13/X42Cr13/M310 steel, we can provide round bars and plates. Round rods can be sawn to the length you need and used as single or multiple cut pieces. Grinding tool steel bars can be provided, offering high-quality precision finished bars for strict tolerances.

Product Type	Dimensions	Range
Round Bar	Diameter	16 – 400 mm
	Length	3,000 – 5,800 mm
Flat Bar	Thickness	16 – 300 mm
	Width	200 – 800 mm
	Length	3,000 – 5,800 mm

In addition, we can provide a variety of surface conditions of tool steels:Black；Peeled/Grinded;Turned/Machined/Bright/Milled

Customization of core parameters

Depending on your application scenario, we offer a full range of configurable manufacturing:

✓ Geometric size: Support millimeter precision size customization (tolerance ±0.05mm)

✓ Surface treatment: grinding/polishing/sandblasting can be specified (Ra0.4-6.3μm)

✓ Composition optimization: the ratio of C, Cr, Mo, V and other alloy elements can be adjusted (according to ASTM A681 standard)

Quality Test

We have 2 types of quality inspection, general quality test and high quality test.

1.General quality test include:

• Surface
• Chemical composition
• Size
• Tolerance
• UT testing
• Hardness.

2.High quality test include:

Cold work tool steel:

• Non-metallic inclusion
•  Eutectic carbide.

Hot work tool steel:

• Non-metallic inclusion
• Microstructure
• Band segregation
• Grain size.

Packing and Delivery

Secure packaging, reliable shipping, and a robust tracking system ensure safe and timely deliveries.

1. Delivery time: 1 Month
2. Packing:Bundle, or with all kinds of colors PVC or as your requirements

Production Process

Complete production capacity from raw material selection, EF（Electric Furnace）,LF(Ladle Furnace),VD(Vacuum Debonding), ESR(Electroslag Remelting), Forging, heat treatment, machining to finished die steel.With complete quality inspection means and various quality inspection equipment, it can ensure that all die steel products are subject to strict quality inspection, flaw detection and metallographic inspection.
EF+ LF +VD +Ingot Casting +ESR +Forging +Quenching And Temper +Annealing +Ultra Refinement

1. EF+LF+VD:electric furnace+Ladle furnace+vacuum debonding
2. ESR:Electroslag Remelting
3. Forging
4. Ingot Casting
5. Annealing
6. Brandsaw cutting
7. Turning Milling