Cold Work Tool Steel — International Buyer's Selection Guide

Part 1 - Why This Guide Exists

International purchasers sourcing Chinese-manufactured cold work tool steel frequently encounter three typical challenges in actual procurement operations.

Steel Grade Inconsistencies: Chinese standard tool steel grades (for example, Cr12MoV) have no exact one-to-one equivalent match with AISI D2 or DIN 1.2379 grades. Noticeable variations exist in chemical composition and feasible heat treatment parameters between these cross-standard materials.

Insufficient Technical Documentation: Most overseas importers require material certification documents including EN 10204 3.1/3.2 mill test reports, third-party inspection certificates and compliance documents. However, many domestic Chinese steel mills do not issue these standard export documents by default.

Complex Logistics and Compliance Requirements: The full procurement process involves multiple mandatory procedural elements, including correct HS code classification, Incoterms® 2020 application, packaging fumigation, container loading specifications and certificate of origin issuance.

This guide integrates cross-standard steel grade comparison data, professional technical specifications and core export trade guidelines into one unified reference document. It is designed to assist overseas buyers in making accurate, efficient and compliant purchasing decisions for Chinese cold work tool steel.

Part 2 - International Standards Framework

2.1 Major Standards Systems

2.2 Grade Equivalency Map (Reference Only)  

Part 3 - Detailed Grade Specifications 

3.1 AISI D2 / DIN 1.2379 / JIS SKD11-HV / GB Cr12Mo1V1

English: High-carbon, high-chromium cold-work tool steel, air or oil hardening, deep-hardening, excellent wear resistance, good dimensional stability.

Typical Chemistry (wt%)

Heat Treatment

Material Property Rating

Typical Applications

This grade is widely utilised in general cold forming and tooling operations across industrial manufacturing. Common end uses include stamping and blanking dies for silicon steel motor laminations, and deep drawing dies for stainless steel components applied in kitchenware, industrial sinks and medical equipment production. It also serves well for powder compaction tooling, thread rolling dies, as well as industrial cutting knives and slitters for paper, plastic and thin metal materials. Additionally, the steel is commonly adopted for cold heading dies used to produce medium and high carbon steel fasteners.

Export-Trade Notes

HS Code: 7228.30 (Hot‑rolled bars and rods of other alloy steels)

Reference International Grades & Brands: Bohler K110, Assab XW‑41, Daido DC11, Hitachi SLD

Available Chinese Mill Suppliers: Baowu Steel, Northeast Special Steel, Fushun Special Steel, Changcheng Special Steel

For buyers requiring cleaner material microstructure and ISO 4957 Class 1 non-metallic inclusion ratings, ESR remelted material is highly recommended to meet stringent quality standards.

3.2 AISI D3 / DIN 1.2080 / JIS SKD1 / GB Cr12

Higher-carbon version of D2, maximum wear resistance but lower toughness, used where abrasion dominates over impact.

Typical Chemistry of D3 / 1.2080 / SKD1 / Cr12 (wt%)

Performance Profile

Hardness: 60 – 64 HRC after quenching

Toughness: ★★☆☆☆ (lowest among D-series)

Wear resistance: ★★★★★+ (highest among conventional grades)

Use case: Brick-mold liners, ceramic dies, gauges, drawing dies for abrasive materials

3.3 AISI O1 / DIN 1.2510 / JIS SKS3 / GB 9CrWMn
English: Oil-hardening cold-work tool steel, low distortion after quenching, ideal for thin-section or precision tooling.

Typical Chemistry (wt%)

Heat Treatment

Annealing: 760 – 790 °C, ≤ 217 HBW

Quenching: 800 – 850 °C, oil cool

Tempering: 180 – 220 °C, 60 – 64 HRC

Typical Applications

Precision blanking dies for thin sheet (gauges, electronics, instruments)

Threading dies, taps

Measuring tools, gauges, jigs

Plastic mold inserts

Guide posts, bushings, ejector pins

Export-Trade Notes

HS Code: 7228.30

Substitution logic: O1 can often replace costly D2 in low-stress, high-precision applications - cost saving 40 – 60%.

3.4 JIS DC53 / Approximate DIN 1.2379 Modified

English: High-toughness, high-wear cold-work tool steel, refined version of SKD11 with lower C/Cr and higher Mo. Manufactured primarily by Daido Steel (Japan). No exact AISI equivalent.

Heat Treatment

Annealing: Hardness controlled within 235 HBW maximum

Quenching: Austenitize at 1020–1040 °C, followed by air cooling

Tempering: Dual tempering at 500–530 °C, delivering final hardness of 60–62 HRC

Optional cryogenic treatment

DC53 Technical Advantages for International Buyers

DC53 offers notably improved toughness compared to conventional SKD11, providing better durability for thin-walled tool sections and sharp corner geometries that are prone to chipping.

The material exhibits good Wire-EDM machinability with low susceptibility to edge cracking, making it suitable for high-precision wire-cut tooling.

It maintains high hardness levels after high-temperature tempering, retaining approximately 60 HRC at 500 °C. This property makes DC53 a stable option for pre-coating preparation prior to PVD and CVD surface treatment processes.

Compared with traditional high-carbon high-chrome cold work steels, DC53 requires a lower quenching temperature, which helps minimize heat-treatment distortion and reduces overall processing energy consumption.

Typical Applications

Common industrial uses include progressive stamping dies for electronic connectors, lead frames and terminals. The grade is also widely applied in stainless steel deep drawing tooling, general cold forging dies, and precision blanking operations for sheet thickness below 0.5 mm. Additionally, DC53 is suitable for tool components that require welding repairs after heat treatment.

Export Trade Notes

Origin Reference: DC53 was originally developed and standardized by Daido Steel, Japan.

Domestic Chinese Equivalent Grades: Major Chinese steel mills including Baowu, Fushun Special Steel and Changjiang Special Steel produce commercially equivalent DC53-type tool steel. However, material consistency, inclusion control and heat-treatment response vary significantly across different Chinese manufacturers. For critical applications, buyers are advised to request original Daido mill test certificates or third-party PMI verification reports issued by SGS.

Market Price Range (Reference Only)

Japanese genuine DC53: CNY 1,200 – 2,000 / kg

Chinese equivalent DC53 grade: CNY 350 – 550 / kg

HS Classification: 7228.30 (hot rolled alloy steel bars); 7228.50 (forged alloy steel bars)

3.5 AISI M2 / DIN 1.3343 / JIS SKH-9 / GB W6Mo5Cr4V2

Tungsten-molybdenum high-speed steel, high red hardness, used for high-speed blanking, cold heading, and cutting tools.

Typical Chemistry (wt%)

Typical Chemistry of M2 / 1.3343 / SKH-9 / W6Mo5Cr4V2 (wt%)

Heat Treatment

Annealing: 840 – 880 °C, ≤ 255 HBW

Quenching: 1,210 – 1,230 °C

Tempering: 540 – 570 °C × 3 cycles, 62 – 65 HRC

Typical Applications

High-speed blanking dies (≥ 600 spm presses)

Cold heading dies for high-strength bolts (Grade 8.8, 10.9, 12.9)

Thread rolling dies

Twist drills, end mills, taps, broaches

Ejector pins, punches, wear strips

M2 vs W18Cr4V (T-series)

M35 (Co 5%) / SKH-55 - When to Upgrade

Add 5% Cobalt to M2 → M35 / DIN 1.3243 / JIS SKH-55.

Red hardness: +50 °C over M2

Use case: High-speed cutting, hard machining of ≥ 50 HRC workpieces

Cost premium: ~2× M2

3.6 Powder Metallurgy Tool Steel (PM) 

Representative Grades: ASSAB Vanadis 4 (V4), V8, V10; Bohler S390, S590, S690, S790; Erasteel ASP2030, ASP2060, ASP2080; Daido DEX40, DEX60

Why PM Steel? 

Conventional ingot-cast D2/M2 contains coarse eutectic carbides (20 – 50 μm) that limit wear life and toughness. PM steel uses gas atomization + HIP (hot isostatic pressing) to achieve:

Carbide size < 5 μm (uniform distribution)

5 – 10× tool life vs ingot-cast steel in high-stress applications

Excellent grindability and EDM-ability

Typical Chemistry (wt%)

Typical Applications

This grade is commonly used in precision blanking of electrical steel, including motor rotor and stator laminations, where tooling can achieve a service life of 1.5 km or more under stable production conditions. It is also widely applied in high-speed progressive dies for electronic connectors, lead frames and terminals. Additional common uses include cold extrusion of stainless steel, titanium and Inconel alloys, thread rolling for high-strength fasteners, and industrial cutting blades for paper, plastic and food processing applications.

Export-Trade Notes

Premium Global Suppliers: Assab (Sweden), Uddeholm (Sweden), Bohler (Austria), Erasteel (Belgium), Daido Steel (Japan)

China Domestic PM Steel Supply: Domestic production of PM steel in China is still in the early development stage, with its volume accounting for less than 5% of the country's total PM steel imports. Most domestically produced PM steel is manufactured using remelted imported raw powder.

Market Price Reference (2024–2026): V4 / S390 / DEX40: €25–40 per kg; ASP2060: €50–90 per kg

Life Cycle Cost (LCC) Note: Field data shows that despite the higher unit material cost, the total cost per 1,000 finished parts can be 30–50% lower than conventional D2 steel in high-volume mass production (annual output exceeding 5 million parts).

Part 4 - Comparative Tables

4.1 Chemistry Comparison (wt%)

Typical Chemistry of Common Cold Work & High-Speed Tool Steels (wt%)

4.2 Mechanical Property Comparison

4.3 Hardness Conversion (For Buyer Reference)