USN ESR / 1.2343 ESR Die Steel Blocks
USN ESR tool steel features excellent hardenability, high ductility and stable hot strength. It is ideal for forging presses, aluminium punches, mandrels and bolt forming tooling.
- Standard: USN Kind&Co
- Technique: Forged
- Shape: Block
- Heat treatment: Annealed / Q+T
- Surface Treatment: Black, Machined
- Tolerance: +/- 1%
- MOQ: 1
We supply USN ESR in various custom sizes
block size range
- Thickness: ≤700 mm
- Width: ≤1200 mm
Chemical Composition (%)
Grade | C | Si | Mn | Cr | Mo | V |
USN ESR | 0.38 | 1.00 | 0.40 | 5.2 | 1.30 | 0.4 |
Main characteristics of USN ESR tool steel
- Superior hardenability – consistent hardness across full cross-sections
- High ductility & toughness – minimizes shock-load cracking
- Reliable hot strength – stable performance under continuous high heat
- ESR-refined purity – improves polishability and surface quality
USN ESR tool steel applications
USN ESR steel for Forging press
Engineered with deep hardenability and robust toughness, it retains uniform cross-section hardness and withstands heavy impact loads in long-running forging press operations.
USN ESR steel For punches and mandrels for aluminium
Boasting excellent polishability and steady wear resistance, it delivers precise dimensional accuracy and extended service life for aluminium punches and mandrels in high-volume production.
USN ESR steel for Bolt
With high ductility and uniform ESR-refined structure, it effectively resists cyclic forming stresses and premature cracking for high-volume bolt production tooling.
Our production technology for USN ESR KIND&CO Die Steel
- Melting
- Forging
- Hardening & Annealing
- Finishing
- Stock & Sawing
- Machining
- Vacuum Hardening
- UT 100% SEP1921 Class 3 D/d or E/e
- Spheroidized microstructure as per standard NADCA207-2003 AS1-AS9
- Macrostructure, microstructure, grain size, and impact toughness shall meet the standards specified in GB/T 1299-2025 for Tool and Die Steels.
mechanical properties & heat treatment of USN ESR steel
| Heat temperature | Start forging temperature | Finish forging temperature | Cooling method |
| 1120-1150 °c | 1050-1100 °c | 900-850 °c | Pit or sand cooling |
Annealing
- Temperature 820 - 840 ℃
- Cooling Slow furnace cooling
- Hardness max. 220 HB
Hardening
- Temperature 1000 - 1020 ℃
- Cooling Cooling in air, warm bath of approx. 540 ℃, Oil/polymer; Interrupt oil or polymer quenching at 230 - 280 ℃ or vacuum hardening
Recommendations
- Nitriding possible
- Preheating before use Temperature 150 - 360 ℃ essential
Tempering
- Temperature 520 - 700 ℃
- Hardness see tempering diagram
Why Choose NSPM as Your USN ESR Tool Steel Supplier
Source Direct
Direct mill cooperation ensures stable supply, competitive pricing, and consistent quality. Global resource integration and strong supply chain management guarantee reliable material sourcing and long-term availability.
Stock Ready
50,000+ tons inventory across 11 warehouses enables fast delivery. Flexible cutting, short lead times, and ready stock support urgent demands and improve customers’ production efficiency.
Expert Team
600+ professionals, including R&D specialists and technical engineers, provide application-driven support. Fast response and deep tooling knowledge ensure accurate solutions for diverse industrial needs.
Fully Inspected
Strict quality control system with full traceability, UT testing, and heat treatment records. Certified standards (ISO, CE) ensure every material meets high-performance and reliability requirements.
Full-Chain Machining
From steel supply to precision machining, heat treatment, and equipment manufacturing, NSPM offers integrated solutions that enhance accuracy, efficiency, and overall tooling performance.
