8407 Steel | ASSAB 8407 | Premium H13 ESR Hot Work Tool Steel Supplier

8407 steel is a premium hot‑work die steel produced by Sweden’s ASSAB via electro‑slag remelting (ESR). It features outstanding purity and uniform microstructure, delivering excellent isotropic properties and markedly better resistance to mechanical and thermal‑stress fatigue versus conventional H13 steel.

Depending on regional specifications, the 8407 material is equivalent to upgraded H13, 1.2344 (X40CrMoV5‑1), SKD61, and 4Cr5MoSiV1. It also complies with NADCA #207 premium die‑casting material requirements.

Notably, ASSAB 8407 achieves 1‑2 HRC higher mold hardness than standard H13 with no loss of toughness. Higher hardness inhibits thermal‑fatigue cracking and greatly prolongs tool service life for tough‑duty applications including aluminum die casting, hot forging, extrusion, and high‑grade plastic molds.

Material Shape and Size

1.Round Bar

Flat Bar

8407 Material Equivalent

Standard System	Country/Region	Equivalent Grade	Common Search Terms
ASSAB	Sweden	8407	8407 steel, ASSAB 8407, 8407 material, 8407 tool steel
DIN EN	Germany	1.2344, X40CrMoV5-1	1.2344 steel, DIN 1.2344, X40CrMoV5-1
AISI/ASTM	USA	H13, Premium H13	H13 steel, H13 material, H13 tool steel, AISI H13, H13 ESR
JIS	Japan	SKD61	SKD61 steel, JIS SKD61
GB	China	4Cr5MoSiV1	4Cr5MoSiV1 steel, H13 Chinese standard
Austria	W302	W302 tool steel	W302 tool steel
GOST	Russia	4X5MΦ1C	4Х5МФ1С steel

8407 Steel Composition

Element	C	Si	Mn	Cr	Mo	V
Content (%)	0.39	1.00	0.4	5.2	1.4	0.9

The precise balance of chromium (5.3%), molybdenum (1.3%), and vanadium (0.9%) provides exceptional hot hardness and wear resistance. Low impurity levels ensure superior polishability and isotropic properties

ASSAB 8407 Properties

MECHANICAL PROPERTY	METRIC VALUE	IMPERIAL VALUE
Hardness (Annealed)	≤185 HB	≤185 HB
Hardness (Quenched & Tempered)	45 – 52 HRC	45 – 52 HRC
Tensile Strength (σb)	1420 – 1820 MPa	206 – 264 ksi
Yield Strength (σ0.2)	1280 – 1520 MPa	186 – 220 ksi

Note: 8407 steel enables mold hardness 1-2 HRC higher than conventional H13 without sacrificing toughness . Higher hardness effectively slows thermal fatigue cracking and extends tool life.

Delivery Condition of 8407 Steel

Black Surface, Bright Surface, Turned Surface, Grinded Surface, Poblished surface.

8407 Steel Application

Die Casting Industry: Aluminum die casting dies (cores, cavities, slides, inserts), magnesium and zinc die casting molds, die casting components (shot sleeves, plunger tips, nozzles, spruce pins) for non-ferrous alloys
Hot Forging Industry: Hot forging dies (closed-die and open-die), upset forging dies (bolts, valves, shafts), hot forming tools (punches, heading tools, trimming dies) for aluminum, magnesium, copper, and steel alloys
Extrusion Industry: Aluminum extrusion dies (flat dies, hollow dies, bridge dies), extrusion tooling (mandrels, stems, dummy blocks, containers) for aluminum and magnesium alloys
Plastic Molding Industry: High-performance injection molds for engineering plastics, compression molds, transfer molds for thermosetting plastics, mold bases requiring excellent polishability
Hot Stamping and Hot Pressing: Hot stamping dies, hot pressing tools for high-temperature forming applications
High-Speed Cutting Tools: Tools requiring excellent hot hardness and wear resistance
Other Applications: Thick steel plate punching, scrap shears, hot shears, die rings, wear-resistant parts

Heat Treatment & Processing of 8407 Material

Heat Treatment:

Soft Annealing: Heat to 850°C, hold, furnace cool at 10°C per hour to 650°C, then air cool. Resulting hardness ≤180 HB, optimized for machinability
Stress Relieving: Heat to 650°C, hold 2 hours, furnace cool to 500°C, then air cool. Relieves machining stresses before hardening
Preheating: Two stages: 650-850°C recommended to minimize thermal shock during austenitizing
Hardening (Austenitizing): Temperature 1020-1050°C (1870-1920°F), typical 1020°C. Protect against oxidation and decarburization during heating
Quenching: High-pressure gas quenching (vacuum furnace), air quenching, oil quenching, or salt bath quenching at 450-550°C
Tempering: Double tempering mandatory. Temper immediately after quenching. Hold minimum 2 hours each temper, cool to room temperature between tempers. Avoid tempering in 425-525°C range to prevent temper embrittlement

Processing Guide:

Nitriding: Gas or plasma nitriding possible, surface hardness 900-1100 HV, case depth 0.10-0.30mm. Enhances wear resistance for die casting and extrusion applications
Welding: Preheat 325-350°C, maintain interpass temperature below 475°C, post-weld stress relief required

Quality Inspection & Control of 8407 Steel

Full-process control of 8407 steel: Raw material inspection (certificate, composition); production inspection (composition, mechanical properties, 100% UT, dimensional, surface); finished product inspection (MTC EN 10204 3.1, reports).

Our Advantages

Strong Production Capacity: 10,000 tons/year, advanced equipment.
Adequate Stock: 600+ tons standard specs (3-7 days delivery); custom specs 15-30 days.
Custom Processing: One-stop sawing, milling, drilling, polishing, heat treatment.
Strict Quality Control: Full-process inspection, professional team/equipment.
Global Supply: Container/LCL shipment, anti-rust packaging, on-time delivery.
Professional Technical Support: Senior engineers guide material selection, heat treatment, processing.

FAQ of 8407 Steel:

Q1: What is 8407 steel?

A: 8407 steel is a chromium‑molybdenum‑vanadium hot‑work tool steel produced by electro‑slag remelting (ESR) process, featuring high purity and fine microstructure.

Q2: What is the equivalent standard of 8407 steel?

A: 8407 steel equivalent standards: Chinese GB 4Cr5MoSiV1, US AISI H13, Japanese JIS SKD61, German DIN 1.2344.

Q3: What is the chemical composition of 8407 steel?

A: Typical composition (mass %): C 0.38‑0.39, Si 1.0, Mn 0.4, P ≤0.030, S ≤0.030, Cr 5.2‑5.3, Mo 1.3‑1.4, V 0.9.

Q4: What are the key properties of 8407 steel?

A: It combines good thermal‑shock resistance, crack resistance, high‑temperature strength, hardenability and polishing performance, with stable dimension after heat treatment. The delivery hardness is about HB 180‑185, and the hardness range after heat treatment is 45‑52 HRC.

Q5: What is 8407 steel mainly used for?

A: It is mainly applied to die‑casting dies (aluminum, zinc and copper alloys), extrusion dies, hot forging dies, plastic moulds, as well as hot‑work components such as nozzles, ejector pins and plunger sleeves.