Mold Steel Bar - High-Grade Tool Steel for Injection Molding Dies

Shandong Kuaima Steel Co., Ltd.

Verified Custom manufacturer 7yrs

Technical Specifications of Mold Steel Bar

Property	Parameter	Description
Product Name	Mold Steel Bar	High-performance tool steel for mold and die applications
Material Grade	P20 / 1.2311 / 3Cr2Mo / S50C	International grade equivalents for mold steel
Standard Compliance	ASTM A681, DIN 17350, GB/T 1299, JIS G4404	Meets major international mold steel standards
Carbon (C)	0.28-0.40%	Carbon content for balanced hardness and toughness
Chromium (Cr)	1.40-2.00%	Provides wear resistance and hardenability
Molybdenum (Mo)	0.15-0.40%	Improves high-temperature strength and toughness
Manganese (Mn)	0.60-1.00%	Enhances hardenability and strength
Silicon (Si)	0.20-0.50%	Deoxidizer and improves mechanical properties
Tensile Strength	≥1000 MPa	Minimum tensile strength in hardened condition
Yield Strength	≥850 MPa	Minimum yield strength for mold applications
Hardness Range	28-32 HRC (Pre-hardened) / 48-52 HRC (Heat-treated)	Hardness options for different processing requirements
Diameter Range	10mm - 500mm	Available round bar diameter options
Length	3000mm - 6000mm or custom	Standard and customized length options
Surface Finish	Black, Peeled, Ground, Polished	Multiple surface treatment options available
Heat Treatment	Annealed / Pre-hardened / Fully hardened	Delivery condition options for different applications
Application	Plastic molds, die-casting dies, extrusion tools	Typical mold and tooling applications
Machinability	Excellent in pre-hardened state	Easy to machine and polish for mold making
Certification	EN 10204 3.1, ISO 9001, Material test report	Quality certifications and test documentation provided
Packaging	Bundled with steel strips, wooden case for large sizes	Standard export packaging with moisture protection
MOQ	1 ton	Minimum order quantity for standard grades

Mold Steel Bar - High-Grade Tool Steel for Injection Molding Dies

Mold steel bar represents a specialized category of tool steel engineered specifically for manufacturing injection molding dies, plastic molds, and precision tooling applications. These premium-grade steel bars deliver exceptional hardness, superior wear resistance, and optimal machinability, making them the preferred choice for mold makers, tool and die manufacturers, and precision engineering facilities worldwide. With controlled chemical composition and advanced heat treatment capabilities, mold steel bars ensure consistent dimensional stability and extended service life in demanding production environments.

What is Mold Steel Bar?

Mold steel bar is a pre-hardened or hardenable tool steel product manufactured in round, flat, or square bar configurations, specifically designed for fabricating molds and dies used in plastic injection molding, die casting, and precision forming operations. These bars are produced through controlled melting processes and undergo rigorous quality testing to meet international standards such as AISI, DIN, and JIS specifications.

mold steel bar supplier

Mold Steel Bar Technical Specifications

Common grades include P20 (1.2311), H13 (1.2344), NAK80, and S136, each offering distinct properties. Typical hardness ranges from 28-32 HRC for pre-hardened variants to 48-52 HRC after heat treatment. Chemical composition varies by grade, with chromium content of 1.4-2.1%, molybdenum at 0.15-0.40%, and carbon levels between 0.35-0.42% for P20 grade per ASTM A681 standards. Standard dimensions range from 10mm to 500mm diameter for round bars, with length options up to 6000mm.

mold steel bar manufacturer

Why Choose Our Mold Steel Bar Solutions

Our mold steel bars are sourced from ISO 9001:2015 certified mills employing electric arc furnace and vacuum degassing technology to ensure superior purity and homogeneity. Each bar undergoes ultrasonic testing per ASTM A388 to guarantee internal soundness. We maintain extensive inventory across multiple grades, enabling rapid delivery times of 7-15 days for standard sizes. Our technical support team provides material selection guidance and heat treatment recommendations tailored to your specific molding applications.

Frequently Asked Questions

What is the minimum order quantity (MOQ)?

Our standard MOQ is 500 kilograms per grade and size specification. For high-volume requirements exceeding 5 metric tons, we offer mill-direct pricing with customized cutting services. Sample pieces of 10-20kg are available for material evaluation and testing purposes.

mold steel bar China

Do you provide material test certificates?

Yes, we supply comprehensive Mill Test Certificates (MTC) compliant with EN 10204 3.1 standards for every shipment. Documentation includes chemical composition analysis, mechanical property verification, hardness testing results, and heat treatment records. Third-party inspection by SGS or Bureau Veritas can be arranged upon request.

What is the typical delivery time?

Standard inventory items ship within 5-7 business days after order confirmation. Custom sizes requiring cutting or special heat treatment typically require 15-20 days. Express processing is available for urgent requirements, with air freight options to major international destinations ensuring delivery within 10-12 days.

Can you cut to custom sizes?

Absolutely. Our precision sawing facility accommodates cutting tolerances of ±0.5mm for lengths and ±0.2mm for cross-sectional dimensions. We offer saw-cut, milled, or ground surface finishes depending on your machining requirements. CNC machining services for complex profiles and shapes are available through our partner workshops.

Get a Competitive Quote for Mold Steel Bar

Request your customized quotation today by providing grade specification, dimensions, quantity requirements, and delivery destination. Our sales engineers respond within 4 business hours with detailed pricing, technical datasheets, and logistics solutions. Benefit from our factory-competitive pricing structure, flexible payment terms, and comprehensive after-sales support for all your mold steel bar procurement needs.

Ratings & Reviews

5.0

Very satisfied

Based on 8 reviews for verified purchases

Supplier service

5.0

On-time shipment

5.0

Supplier service

5.0

John Anderson

United States

verified purchases

2025-09-10

Superior P20 Modified Steel for Medical Device Molds
Procured 1.8 tons of P20 modified mold steel bars (various diameters 100-180mm, lengths to 3500mm) for medical device injection molds requiring FDA compliance. Material purity exceeded expectations with sulfur content below 0.003%. Dimensional accuracy was exceptional with diameter tolerance within ±0.15mm. SGS third-party inspection confirmed all mechanical properties. Supplier provided comprehensive heat treatment recommendations for achieving 52 HRC after hardening. Delivered to our California facility in 14 days including customs clearance.

William Taylor

Australia

verified purchases

2025-09-28

Acceptable Quality with Initial Documentation Delay
Ordered 600 kilograms of 718 mold steel bars (flat bars 60mm x 200mm) for marine equipment mold production. Material quality met our specifications with hardness at 33 HRC. Machining characteristics were acceptable for our application. Initial shipment arrived without complete test certificates, causing a 5-day project delay. Supplier promptly sent missing documentation via courier and offered 3% discount on next order. Issue was resolved professionally. Material performance has been satisfactory in service.

Ahmed Al-Hassan

UAE

verified purchases

2025-10-15

Perfect Solution for Complex Mold Applications
This is our fourth order - 2.5 tons of mixed grades (P20, H13, and 718 steel bars) for our mold workshop in Dubai. Consistent quality across all shipments with full Mill Test Certificates matching EN 10204 3.1 requirements. The technical team helped us select appropriate grades for different plastic resins and operating temperatures. Vacuum degassing process ensures superior cleanliness. Express processing completed our urgent 500kg H13 order in just 12 days. Excellent long-term partnership.

Carlos Silva

Brazil

verified purchases

2025-11-02

Reliable NAK80 Steel for Plastic Injection Molds
Purchased 1.2 tons of NAK80 mold steel bars (120mm diameter, 4000mm length) for automotive interior component molds. Material arrived pre-hardened at 38 HRC as specified, ready for CNC machining. Homogeneity was good throughout the cross-section. Documentation included complete chemical composition and mechanical properties per JIS standards. Packaging could be improved as minor rust spots appeared on two bars during ocean freight, but easily removed with light grinding.

Robert Brown

United Kingdom

verified purchases

2025-11-20

Premium Pre-Hardened P20 with Fast Delivery
Received 3.2 tons of pre-hardened P20 mold steel bars (various sizes from 80mm to 250mm diameter) within 9 days via air freight to Manchester. All bars tested at 29-31 HRC, perfect for direct machining without additional heat treatment. Custom cutting service was precise with tolerances within ±0.3mm. Sales engineer responded to our technical queries within 3 hours. This supplier has become our primary source for urgent tooling projects requiring quick turnaround.

Hans Mueller

Germany

verified purchases

2025-12-08

Good Value S136 Steel for Optical Lens Molds
Ordered 850 kilograms of S136 stainless mold steel (100mm diameter round bars) for precision optical component molds. Material quality was solid with good corrosion resistance and mirror polishing capability. EN 10204 3.1 certificates provided complete traceability. Delivery took 18 days, slightly longer than quoted 15 days, but acceptable. Pricing was competitive compared to European mills. Minor surface marks on two bars required additional grinding, but overall good value for the cost.

James Wilson

United Kingdom

verified purchases

2025-12-23

Outstanding H13 Steel Bar Quality for Die Casting Molds
We purchased 1.5 tons of H13 tool steel bars (200mm x 200mm square, 2500mm length) for our aluminum die casting mold project. The material showed excellent thermal fatigue resistance after heat treatment to 48 HRC. Chemical analysis matched DIN 1.2344 specifications perfectly with chromium at 5.1%. Surface finish was superior to our previous supplier. Technical support team provided detailed heat treatment curves. Highly recommended for high-temperature applications.

Michael Chen

Singapore

verified purchases

2026-01-07

Excellent P20 Mold Steel Bar for High-Volume Production
Ordered 2.8 tons of P20 grade mold steel bars (150mm diameter, 3000mm length) for our injection molding die manufacturing. Material certificates confirmed hardness at 30 HRC and carbon content 0.37% per ASTM A681. Machining performance was outstanding with consistent chip formation. Ultrasonic test reports showed zero internal defects. Delivered in 11 days to our Singapore facility. Already processing our second order for NAK80 grade.