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6F7 1.2767 SKT6 Cold Work Tool Steel

1.2767 Cold Work Tool Steel offer high toughness, excellent impact strength, and deep hardenability. With good wear resistance and dimensional stability, ideal for large dies, forming tools, and shear blades.

Standard: AISI 6F7, DIN 1.2767（X45NiCrMo4）, JIS SKT6
Technique: EAF + LF + VD or ESR, forged, multi-directional forging ratio ≥4, spheroidized annealed
Shape: Round, Flat, Plates, Blocks
Heat treatment: Supplied in annealed condition, hardness ≤248 HBW; prehardened to 48–52 HRC (quenched and tempered) available on request
Surface Treatment: Black (hot-rolled / forged surface), turned, milled / ground, sawn ends
Tolerance: flat bars & plates thickness: +0.5/-0.0 mm (turned); forged blocks: ±0.2 mm
MOQ: 1 Ton

We supply DIN 1.2767 in various custom sizes

Chemical Composition (%)

Grade	C	Si	Mn	P (≤)	S (≤)	Cr	Mo	V	Ni
1.2767 (X45NiCrMo4)	0.40–0.50	0.10–0.40	0.20–0.50	0.030	0.030	1.20–1.50	0.15–0.35	—	3.80–4.30
6F7	0.45–0.55	0.20–0.50	0.50–0.80	0.030	0.030	1.00–1.40	0.30–0.50	0.15–0.35	3.50–4.00
SKT6	0.40–0.50	0.15–0.35	0.35–0.55	0.030	0.030	1.30–1.60	0.25–0.40	0.15–0.25	3.80–4.30

Main characteristics of 1.2767 tool steel

6F7 | 1.2767 | SKT6 tool steel applications

1.2767 steel for Heavy-Duty Cold Heading Die

High nickel content grants 1.2767 exceptional core toughness, enabling it to withstand repeated heavy shock loads in cold heading of fasteners without failure.

1.2767 steel for Hot Forming Punch & Mandrel

Good high-temperature strength combined with deep hardenability ensures reliable performance in hot punches and mandrels operating under sustained thermal cycling.

1.2767 steel for Master Die & Die Holder

Superior hardenability through large sections and excellent dimensional stability make it ideal for master dies and die holders requiring uniform hardness and long service life.

Our Production Technology For 1.2767 (X45NiCrMo4 / AISI 6F7 / SKT6) Cold Work Tool Steel

Ultrasonic testing (UT) 100% as per SEP 1921, ASTM A388, or EN 10228-3 (upon request)
Micro Cleanliness as per ASTM E45 or DIN 50602
Spheroidized microstructure as per relevant tool steel standards
Macrostructure, microstructure, grain size, and mechanical properties shall meet the standards specified in GB/T 1299 for Tool and Die Steels
Delivery condition: Soft annealed, hardness max. 260 – 262 HB
ESR version available: 1.2767 ESU (Electroslag Remelted) offers improved material purity, higher tensile strength and compressive strength for the most demanding applications

mechanical properties & heat treatment of 1.2767 steel

Heat temperature	Start forging temperature	Finish forging temperature	Cooling method
1050 – 1100 °C	1050 – 1000 °C	≥ 850 °C	Pit, sand, or furnace cooling

Annealing

Heat slowly and uniformly to 610 – 650°C (or up to 850°C per some sources)
Hold at temperature for 2 – 5 hours, depending on section thickness
Cool slowly in the furnace at a controlled rate of 10 – 20°C/h down to approximately 600°C
Then air cool to room temperature
Hardness after annealing: max. 260 – 262 HB
Annealing in a protective atmosphere is recommended to reduce decarburization and surface scaling

Hardening

1.2767 (X45NiCrMo4 / 45NiCrMo16) is a nickelalloyed cold work tool steel that can be hardened in both oil and air, providing flexibility for distortion control. The steel exhibits excellent through-hardenability and can be quenched in air to minimize distortion. Temper immediately after quenching.
Pre-heating (recommended): Pre-heat the tool slowly to 650 – 700°C and thoroughly soak. For multi-stage pre-heating, a range of 600–850°C is also acceptable
Austenitizing temperature: 840 – 870°C.
Alternative range: 830 – 860°C per Fushun Special Steel
Holding time: After temperature equalization, hold for 15 – 30 minutes (or 30 minutes per 25mm of section thickness)
Quenching media:
Oil — preferred for most sections, provides maximum hardness (54–58 HRC)
Air (still air or pressurized gas) — for minimizing distortion, particularly suitable for smaller sections
Warm bath at 180 – 220°C (martempering) — as an alternative hardening procedure for complex shapes requiring minimum distortion
Warm bath at 220 – 300°C or 450 – 500°C — per additional specifications
Hardness after quenching: approx. 53 – 58 HRC.
Oil or salt bath quenching: 54 – 58 HRC
Air quenching: 53 – 57 HRC

Stress relieving

Perform after rough machining or heavy stock removal, especially for tools with complex shapes or unbalanced cross-sections, to reduce the risk of distortion during final heat treatment
Heat carefully to 650°C
Hold at temperature for 1 – 2 hours (or 2–4 hours for larger sections)
Air cool after holding (or furnace cool per some specifications)
This operation is performed to relieve stresses set up by extensive machining and to reduce distortion during heat treatment

Tempering

Temper immediately after the workpiece cools to hand-warm temperature (approx. 50–70°C). Delayed tempering may cause cracking
Number of tempers: Minimum 2 times. Double tempering is recommended to improve toughness and ensure complete transformation of retained austenite. After each tempering cycle, air cool to room temperature before the next tempering
Holding time: Soak for at least 1 hour per 20mm of section thickness (minimum 2 hours per cycle)
Cooling method: Air cool after each tempering cycle
Tempering temperature ranges:
150 – 250°C: For highest hardness (54–56 HRC) with excellent wear resistance — suitable for shear blades and cutting tools.
300 – 400°C: For balanced hardness and toughness (46–52 HRC) — suitable for general cold forming tools.
540 – 600°C: For applications requiring maximum toughness (48–55 HRC) — suitable for highly stressed impact tools

Why Choose NSPM as Your 1.2767 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.