Bs Bh13 Die Steel Overview The Standard H13 Type - China

What Is BS BH13 Die Steel?

BS BH13 die steel is the British Standard designation for a hot work tool steel, specified under BS4659 and cross-referenced to BS EN ISO 4957 as X40CrMoV5-1 (material number 1.2344) .

In practical terms, BH13 is the **UK's national standard name for the global H13-type steel family** — the world's most widely used hot work die steel .

For B2B buyers working with British drawings, legacy UK specifications, or Commonwealth supply chains, "BH13" is the key designation that unlocks equivalent sourcing under AISI H13 (USA), DIN 1.2344 (Germany), JIS SKD61 (Japan), and GB 4Cr5MoSiV1 (China) .

Key Properties

| Property | BH13 (H13-type) |

| Supply condition | Soft annealed, typically ≤229–235 HB |

| Working hardness | 44–52 HRC (application-dependent) |

| Hardening | Air/oil/vacuum, 1020–1080 °C |

| Thermal conductivity | ~19–25 W/m·K (20–500 °C) |

| Character | Air-hardening; low distortion; excellent polishability |

| Tempering | Double or triple tempering recommended | Core performance strengths:

1 - Red hardness – retains strength and hardness during prolonged exposure to elevated temperatures .

2 - Thermal fatigue resistance – withstands repeated heating/cooling cycles (die casting, forging) without network cracking (heat checking).

3 - Toughness at hardness – the moderate carbon design delivers impact toughness that high-carbon cold work steels cannot match.

4 - Dimensional stability – air hardening minimizes distortion; low volume change through heat treatment.

5 - Machinability & polishability – good machinability in the annealed condition and excellent polishability for cavity finishing .

Typical Applications

Aluminum, zinc & magnesium die casting – dies, cores, inserts, sprue bushings

Hot forging & pressing dies – hammer and press dies, punches, headers Extrusion tooling– mandrels, containers, liners, backers, stems for aluminum, copper and brass Hot shearing & trimming – shear blades, hot cut tools

Plastic injection molds – high-gloss, thermally stressed cavities and cores

Company Contact:

• Posted By: Dongguan Songshun Mould Steel Co., Ltd.

• Phone: 0086 0769 85475596

• Address: 1st Floor, No. 1, Dongda Fourth Street, Shatou Community, Chang'an Town, Dongguan , GuangDong , China

• Email:

• Website: https://songshunsteel.com/

• Business Description: Established in 2009,Songshun Steel supplies a wide range of carbon, alloy and tool steel products, including high speed tool steel, cold work tool steel, hot work tool steel, plastic mould steel, engineering steel and machine structural steel etc.
  
  After more than 10 years development and growing, Songshun Steel becomes one comprehensive special steel factory, stockist and exporter.
  
  Combined with experienced exporting team and professional technical knowledge, Songshun Steel offers both technical advice and support, as well as global professional steel solution and service.
  
  Due to satisfactory reliable quality and professional service, Songshun expands our market worldwide, such as Colombia, Chile, Spain, Turkey, Iran, Vietnam, Malaysia ,UAE, Canada, Brazil, Mexico and so on.
  
  Songshun specialized in Special Steel for almost 20 years.
  
  We can supply mold steel, high speed steel, alloy steel, free cutting steel and etc.
  
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