Hot Work Mold Steel

Name: China Hot Work Mold Steel Manufacturers Suppliers - Wholesale Hot Work Mold Steel for Sale
Brand: Promisteel
SKU: 293426554

NAME: Hot Work Mold Steel / Die Casting Steel
BRAND: PROMISTEEL
GRADES: H13, H11, SKD61, 1.2344, 1.2343, 5CrNiMo
SHAPES: Round Bar, Flat Bar, Plate, Forged Block
DELIVERY CONDITION: EAF+LF+VD+(ESR), Annealed, Machined
SURFACE: Black, Peeled, Milled, Grinded
HARDNESS: Annealed ≤229 HB; Quenched ≥52-54 HRC
APPLICATION: Al/Mg Die Casting, Forging Dies, Extrusion Dies
MOQ: 25 Tons

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Product Introduction

Hot Work Mold Steel is engineered to withstand extreme heat, pressure, and abrasion. Unlike cold work steels, these materials must maintain high hardness and strength at elevated temperatures (often exceeding 500°C) without losing their structural integrity.

Our flagship product, H13 Tool Steel (1.2344 / SKD61), is the global industry standard for Die Casting and Extrusion. Produced using EAF+LF+VD and optional ESR (Electroslag Remelting) processes, our steel offers exceptional cleanliness and uniform microstructure. This ensures superior resistance to "heat checking" (thermal fatigue cracking), making it the preferred choice for manufacturing long-life molds for aluminum, magnesium, and zinc alloys.

Product Specifications & Grade Equivalents

We supply a comprehensive range of Hot Work Steels, from standard forging grades to premium ESR die-casting grades.

Table-1

Compare grades to find the exact match for your thermal applications.

International Grade Comparison
GB (China)	ASTM / AISI (USA)	DIN (Germany)	JIS (Japan)	Primary Application
4Cr5MoSiV1	H13	1.2344 (X40CrMoV5-1)	SKD61	Al/Mg Die Casting, Extrusion
4Cr5MoSiV	H11	1.2343 (X37CrMoV5-1)	SKD6	High Toughness Die Casting
5CrNiMo	L6 (Similar)	1.2714 (Similar)	SKT4	Hammer Forging Dies
3Cr2W8V	H21	1.2581	SKD5	High Heat Resistance

Table-2

Balanced alloy content for optimal Red Hardness and Toughness.

Chemical Composition (Mass Fraction %)
Grade	C	Si	Mn	Cr	Mo	V	Ni
H13 / 1.2344	0.32~0.45	0.80~1.20	0.20~0.50	4.75~5.50	1.10~1.75	0.80~1.20	-
H11 / 1.2343	0.33~0.43	0.80~1.20	0.20~0.50	4.75~5.50	1.10~1.60	0.30~0.60	-
5CrNiMo	0.50~0.60	0.25~0.60	0.50~0.80	0.50~0.80	0.15~0.30	-	1.40~1.80
H21	0.30~0.40	≤0.40	≤0.40	2.20~2.70	-	0.20~0.50	W: 7.5~9.0

Table-3

Available in forged blocks and rolled bars.

Supply Range & Size Specifications
Product Form	Thickness/Diameter (mm)	Width (mm)	Length (mm)	Surface Finish
Round Bar	Φ 10 - 800 mm	-	3000 - 6000	Black / Peeled / Turned
Flat Bar	20 - 400 mm	50 - 1000	2000 - 5800	Black / Machined
Steel Block	200 - 800 mm	200 - 1200	Custom	Forged/Milled
Plate	10 - 150 mm	500 - 2000	2000 - 6000	Hot Rolled

Key Features and Advantages

Excellent Thermal Fatigue Resistance: Specifically engineered to resist surface cracking (heat checking) caused by rapid heating and cooling cycles in die casting.
High Red Hardness: Maintains hardness and strength even when the mold surface temperature exceeds 550°C.
Superior Toughness: Our H13 and H11 grades offer excellent ductility to prevent catastrophic cracking under heavy impact loads (e.g., in forging).
Good Machinability & Polishability: Especially in ESR (Electro-Slag Remelted) grade, the steel has a high purity level, allowing for a mirror polish on plastic molds or die casting dies.
Dimensional Stability: Minimal distortion during hardening ensures precision components fit perfectly.

Typical Applications

Hot Work Mold Steel is the critical material for high-temperature manufacturing processes:

Aluminum/Magnesium Die Casting Molds

The primary application for H13 (1.2344) due to its balance of heat resistance and toughness.

Hot Forging Dies

Used for hammer forging dies and press dies where impact resistance is key (often uses 5CrNiMo or H11).

Extrusion Dies

For extruding aluminum and copper profiles.

Plastic Molds

Used for large plastic molds requiring high toughness and polishability.

Hot Shear Blades

For cutting hot steel billets and bars.

FAQ

Q1: What is the difference between H13 and H11 Steel?

A1: Both are Chromium hot work steels. H13 (1.2344) contains more Vanadium (V) than H11 (1.2343). This gives H13 better wear resistance and temper resistance at high temperatures. However, H11 has slightly better toughness. H13 is the preferred choice for die casting, while H11 is excellent for high-impact forging.

Q2: Why should I choose ESR H13 over standard H13?

A2: ESR (Electroslag Remelting) removes impurities (Sulfur, inclusions) from the steel. ESR H13 has a much finer microstructure, which significantly improves thermal fatigue resistance (longer die life) and allows for a much better surface polish. For critical die casting molds, ESR is highly recommended.

Q3: What is the typical working hardness for H13 dies?

A3: For aluminum die casting, the typical hardness is 46-50 HRC. For extrusion dies, it can be slightly higher (48-52 HRC). For forging dies, a range of 42-48 HRC is common to ensure toughness.

Q4: Can you supply 1.2344 EFS (Extra Fine Structure)?

A4: Yes, we supply premium grades comparable to EFS quality using our ESR process and special heat treatment, ensuring an isotropic structure that maximizes tool life.

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