A cluster with an institution behind it
Karachi's tool, die, and mold trade isn't informal, it has a government-backed support institution: the Karachi Tools, Dies and Moulds Centre (KTDMC), a Pakistan Industrial Development Corporation subsidiary based in Korangi Creek Industrial Park, set up specifically because studies by TUSDEC (the Technology Upgradation and Skill Development Company) found Pakistan's tool and die industry short on skilled manpower, modern technology, and quality understanding relative to the automotive and manufacturing demand it needed to serve. KTDMC's role is to provide training, consultancy, and modern machine shop facilities to the local tool, die, and mold industry, most of it tied to the automotive supply chain the way it is in most industrialized economies. For a steel supplier, that means the Karachi tool and die trade is a real, identifiable, organized buyer segment with an institutional backbone, not a scattered set of one-off customers.
The four grades that cover most of the demand
D2, high-carbon high-chromium, air hardening, the default for cold-work blanking, forming, and thread rolling dies. Reaches around 62 HRC after heat treatment and is sourced entirely as imported bar or plate, commonly cross-referenced as DIN 1.2379.
| Property | D2 Tool Steel | H13 Tool Steel | K100 Tool Steel |
|---|---|---|---|
| Category | Tool Steel | Tool Steel | Tool Steel |
| Carbon (C) | 1.4 to 1.6% | 0.32 to 0.45% | 2 to 2.2% |
| Chromium (Cr) | 11 to 13% | 4.75 to 5.5% | 11.5 to 12.5% |
| Nickel (Ni) | 0.3% | 0.3% | Not published |
| Molybdenum (Mo) | 0.7 to 1.2% | 1.1 to 1.75% | Not published |
| Hardness | 62 HRC | Not published | 60 to 62 HRC |
| Density | 7.70 g/cm³ | 7.80 g/cm³ | 7.70 g/cm³ |
| Group | Cold-work tool steel (Group D) | Chromium hot-work tool steel (Group H) | Cold-work tool steel (D3-type) |
Confirm against the mill test certificate before specifying. Chat with us if you need help matching a grade to a job.
H13, chromium-molybdenum hot-work steel, the grade for die-casting dies, hot forging dies, and hot extrusion dies, anywhere the tool itself gets hot in service. Tensile strength runs 1200 to 1590 MPa depending on tempering, and it's readily weldable, useful for repair work on existing dies.
K100, a higher-hardness, oil-hardening alternative to D2, worth stocking as a secondary option rather than a high-turnover item, narrower demand but real when a job needs maximum hardness over toughness and the shop has oil-quenching capability.
P20, pre-hardened mold steel, the default for plastic injection and die-casting mold bodies, distinct from the three tool steels above in that it's meant to be machined into complex mold geometry rather than a simple die shape, and it's supplied pre-hardened so the mold shop doesn't need in-house heat treatment capability.
How to ask the right qualifying question
A customer asking for "die steel" without naming a grade almost always means one of D2, H13, or K100, the follow-up question that narrows it fast is simple: does the tool run hot in service, or does it stay at room temperature? Hot means H13. Room temperature and wear resistance matters most means D2. Room temperature and maximum hardness matters more than toughness means K100. A customer asking for "mold steel" is almost always asking about P20 or one of its variants, P20-Ni for thick sections, 2083 for corrosion-resistant, high-polish applications.
Sourcing reality
None of these four grades are rolled in Pakistan, all four come in as imported bar, plate, or block, mostly from European, Japanese, or Chinese specialty steel mills. That means lead time and minimum order quantity matter more here than for a commodity grade like mild steel, worth setting that expectation with Karachi tool room customers upfront rather than promising a turnaround that a specialty import can't realistically meet.
Why depth matters more than breadth here
A supplier who can speak fluently about which of these four grades fits a given job, and can back it up with real composition and heat treatment detail rather than a generic sales pitch, earns trust with a technical buyer faster than one competing purely on price. Tool room buyers in this cluster tend to be repeat customers once they find a supplier who understands the difference between D2 and H13 without needing it explained twice.
Quoting a tool or die job? Send the application and we'll help confirm the right grade.