Aluminium Die Casting Die Block Forgings
Forged H13 die blocks and core inserts for high-pressure die casting of aluminium alloys, where sustained thermal cycling to 150,000-500,000 shot cycles demands H13's hot hardness and heat-check resistance.
AISI/SAE H13
= DIN 1.2344 — Same Underlying Alloy
800×800×500 mm
Max Forged Die Block Dimensions
44–52 HRC
Standard Heat-Treated Hardness Range
ESR Grade Option
Premium Cleanliness for HPDC & Extrusion Dies
The Global Workhorse Hot-Work Grade — Same Steel, American Naming Convention
AISI H13 is the world's most widely specified hot-work tool steel, and its enduring dominance across aluminium die casting, hot extrusion, and hot forging die applications comes down to a genuinely well-balanced property combination: roughly 5% chromium alloying provides good hardenability and resistance to heat checking, molybdenum and vanadium additions contribute secondary hardening and fine, stable carbide formation that sustains hot hardness at elevated die-service temperature, and the overall alloy system responds predictably to standard hardening and double-temper heat treatment, giving toolmakers a well-characterized, thoroughly proven material to design around. It's worth being explicit that H13 is not a distinct alloy from DIN 1.2344 — H13 is simply the AISI/SAE designation for the identical chromium hot-work tool steel that German and European specification convention identifies by its material number, 1.2344; the two names describe the same underlying chemistry and property range, and a forging supplier working across both American/Asian and European customer bases needs fluency in both naming conventions rather than treating them as separate materials requiring separate sourcing logic. For die casters, extrusion toolmakers, and forging die shops specifying by AISI/SAE convention, H13 remains the default starting-point grade against which alternative hot-work tool steels are typically compared.
AISI H13 Forged Products
Hot Extrusion Die and Mandrel Forgings
Forged H13 extrusion die, die holder, and mandrel blank forgings for aluminium, copper, and steel extrusion tooling, sustaining thermal stability at 550-650°C service temperature through extended production campaigns.
Hot Forging Die Insert Forgings
Forged H13 die blocks and inserts for hammer, screw press, and hydraulic press hot forging operations, forged to controlled reduction ratio breaking up carbide networks for homogeneous die microstructure.
ESR-Grade H13 Premium Die Blocks
Electro-slag remelted H13 die block forgings for critical HPDC and extrusion tooling applications, reducing inclusion content and macro-segregation for extended thermal fatigue life over standard EAF-grade H13.
Heat Treatment, Testing and Quality for H13 Forging Supply
Hardening and Double-Temper Heat Treatment
In-house hardening at 1000-1050°C, oil or gas quench, double temper at 550-600°C developing target hardness of 44-50 HRC for forging die applications, higher for wear-critical punches and inserts.
Chemistry Certification to AISI/SAE Specification
Full chemistry certification (chromium, molybdenum, vanadium, silicon, manganese) against AISI H13 compositional requirements, with heat number traceability from mill to finished forging.
Ultrasonic Testing for Large Die Blocks
Ultrasonic testing to ASTM A388 for large H13 die blocks, detecting internal porosity, inclusions, or laminations before customer machining investment, mandatory practice for ESR-grade critical tooling.
Full Dimensional and Material Certification
Dimensional inspection against customer drawing or standard tolerance schedule, with EN 10204 3.1/3.2 material certification supporting toolroom qualification requirements.
The Global Workhorse Hot-Work Grade — Same Steel, American Naming Convention
AISI H13's position as the default hot-work tool steel specification across die casting, extrusion, and hot forging tooling worldwide reflects decades of accumulated industrial validation rather than any single standout property: its chromium-molybdenum-vanadium alloying delivers a genuinely well-rounded combination of hot hardness retention at elevated die-service temperature, resistance to the thermal fatigue cracking (heat checking) that repeated rapid heating and cooling cycles induce in die surfaces, and predictable, thoroughly characterized response to standard hardening and double-temper heat treatment — a combination that has made H13 the grade against which essentially every alternative hot-work tool steel gets compared, rather than a niche or specialized option.
It's worth stating plainly, for any supplier or buyer navigating cross-regional tool steel sourcing, that H13 and DIN 1.2344 are not two different steels that happen to share similar properties — they are the same underlying chromium hot-work tool steel alloy, identified through two different regional naming conventions. AISI/SAE nomenclature, more common in North American and many Asian specification systems, designates the grade H13; the DIN Werkstoffnummer system that German and broader European specification convention relies on designates the identical alloy as material number 1.2344. A forging manufacturer serving a genuinely international toolmaking customer base needs to speak both naming conventions fluently and be able to quote, manufacture, and certify against whichever designation a given customer's drawing specifies, without treating the two as requiring separate sourcing or qualification processes.
The practical value H13 delivers across its core applications comes down to matching the alloy's hot-work properties to genuinely demanding thermal service conditions: aluminium die casting dies cycle repeatedly between molten metal injection temperature and cooling water contact across hundreds of thousands of shots, extrusion tooling sustains continuous elevated temperature exposure across extended production runs, and hot forging dies absorb both thermal cycling and mechanical impact loading simultaneously. H13's combination of hot hardness, heat-check resistance, and toughness addresses all three service environments adequately without requiring a different specialized grade for each — precisely the versatility that has sustained its position as the default hot-work tool steel specification for so long.
For die casters, extrusion toolmakers, and hot forging die shops specifying by AISI/SAE convention, Shivam Forge manufactures H13 die blocks and billets up to 800×800×500 mm with standard and ESR-grade options and full heat treatment to customer HRC target. Contact our engineering team at +91-9265772827 or sales@shivamforge.com with your drawing and required condition for a manufacturability review and quotation.
Frequently Asked Questions
Is AISI H13 the same as DIN 1.2344?
Yes. H13 is the AISI/SAE designation, and 1.2344 is the DIN material number (Werkstoffnummer), for the same chromium-molybdenum-vanadium hot-work tool steel — same alloying intent and comparable composition range. We manufacture and certify to either designation depending on which specification convention your project or customer's drawing calls for.
What is the maximum die block size you can forge in H13?
We forge H13 blocks up to 800×800×500 mm and round billets from 50 to 500 mm diameter. For larger dimensions, contact us with your drawing — we can often accommodate larger blocks through our press capacity or Rajkot forging cluster partnerships.
Do you supply ESR-grade H13?
Yes. ESR-grade H13 is available for critical HPDC die applications, large forging die inserts, and extrusion tooling where inclusion content and homogeneity are critical to thermal fatigue life. ESR adds 15-25% to material cost, offset by significantly reduced premature cracking risk in high-cycle applications.
What hardness range do you supply H13 die blocks in?
Standard target hardness is 44-50 HRC for forging die inserts, with higher hardness available for wear-intensive punches and inserts. We also supply H13 in the annealed condition (≤229 HB) for customers who prefer to machine soft and heat-treat separately.
How do I order H13 forgings from Shivam Forge?
Send your drawing, block or billet dimensions, quantity, and required condition (annealed, ESR-grade, or heat-treated to HRC) to sales@shivamforge.com or call +91-9265772827. We confirm material availability and provide a quotation within 24-48 hours.
Why Choose Shivam Forge
Trusted forging manufacturer — Rajkot, Gujarat
Shivam Forge delivers precision hot-forged components from our integrated Shapar, Rajkot facility — covering forging, CNC machining, heat treatment, and quality inspection under one roof.
- Hot forging from quality alloy steel billets (42CrMo4, C45, EN8, SS316L)
- In-house CNC/VMC machining to drawing — ±0.05mm tolerances
- Heat treatment — normalizing, hardening, tempering, annealing
- CMM inspection and full EN 10204 3.1 material certification
- Custom OEM forging from customer drawings — PPAP/ISIR available
- Fast export from Mundra Port — CIF worldwide, FOB India
- Export expertise — Europe, Middle East, Americas, Asia-Pacific