8418
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8418 die steel (Swedish ASSAB standard, corresponding to American Standard H10 modified type), with "high purity + isotropic toughness + thermal fatigue resistance" as its core advantages, is the preferred material for high-end die-casting dies and hot forging dies.
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Product information
product model: 8418
product parameter
Steel grade | Comparison of Steel Grades by Country | Technical Conditions | Chemical Constituents | ||||||||||||||
C | Cr | Mo | V | S | P | Si | Mn | Ni | W | Al | Cu | Nb | Co | B | |||
8418 |
Sweden(8418)
| Protocol | 0.33 ¦ 0.40 | 5.00 ¦ 5.50 | 2.30 ¦ 2.60 | 0.40 ¦ 0.90 | ≤0.015 | ≤0.030 | 0.20 ¦ 0.60 | 0.20 ¦ 0.50 |
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8418 die steel (Swedish ASSAB standard, corresponding to American Standard H10 modified type), with "high purity + isotropic toughness + thermal fatigue resistance" as its core advantages, is the preferred material for high-end die-casting dies and hot forging dies.
Smelting method
Core process: five-step smelting process: Arc furnace (EF) primary smelting → LF ladle refining → VD vacuum degassing → mould pouring → electroslag remelting (ESR);
Function: LF deep desulfurization (S ≤ 0.0005%), VD hydrogen/oxygen gas removal (O ≤ 15 ppm); ESR is further purified to eliminate non-metallic inclusions and improve the uniformity and isotropy of the structure;
Innovative technology: argon protection casting + temperature control of mold bath to reduce zonal segregation;
Process characteristics
Heat treatment process
Process | Parameter | Target effect |
annealing | 850~880℃slow cooling to 500℃then air cooling | Hardness ≤180 HB,easy to process |
Quenching | 1020~1050℃oil cooling/gas quenching | Hardness 52~56 HRC(grain size 8~10 ) |
Tempering | Twice tempering(555~650℃) | Hardness 45~52 HRC,the secondary hardening is stimulated. |
Critical control points
Avoid the brittle zone of 500 ~ 550 ℃, and the large module shall be subject to step tempering (heat preservation for 1 hour per 25 mm thickness);
Forging process
multi-direction upsetting and drawing (forging ratio ≥ 3), initial forging at 1050-1100 ℃, final forging at ≥ 850 ℃, optimizing metal fiber isotropy;
Innovative process
Ultrafine treatment: quenching at 1030 ℃ and tempering at 600 ~ 620 ℃, the grain size increases from 6.5 to 8.5, and the impact energy is more than 300 J10; Homogenizing pretreatment: keeping the temperature at 1230-1250 deg C for 4.5min/mm, and eliminating segregation;
Purity
Impurity control (mass fraction):
Element | C | S(max) | P(max) | O(max) |
Limit | 0.35~0.38% | 0.0005% | 0.015% | 15 ppm |
Micro-structure
Annealed state: uniform spherical pearlite + fine spheroidized carbide (Cr, CrC, VC); Quenched and tempered state: tempered martensite matrix + dispersed alloy carbide (MoC, VC), grain size ≥ ASTM 8;
The structure after optimization: the tempered sorbite is obtained by ultra-fine treatment, and the grain size reaches 8.5 grade;
Impact work
Conventional process: impact toughness at room temperature ≥ 25 J (hardness HRC 46); The optimized process is as follows: after codirectional forging and homogenization treatment, the unnotched impact energy is not less than 170 J (ESR level), and the highest impact energy can reach 300 J.
Ultrasonic flaw detection
Standard: SEP 1921/ASTM A388;
Level: Ordinary grade: defect ≤ Φ2 mm equivalent; High quality (ESR): full section inspection, defect ≤ Φ1 mm equivalent (for aviation/medical precision parts);
Ex-factory status
Routine: annealed state, hardness ≤ 180 HB (smooth round/black fur round/fine grinding surface);
Optional: pre-hardened (38 ~ 45 HRC), customized by agreement;
Size specification
Type | Size range | Surface treatment |
Round steel | Φ5.5~350 mm × 1~6 m | black skin/fine grinding(Ra≤0.8μm) |
Plate steel | Thickness 0.1~180 mm × W 1220~2440 mm | Hot rolling/milling/mirror |
Wire | Φ3.0~30 mm | special for precision cutter |
Main features
High resistance to thermal fatigue: The initiation time of thermal fatigue crack is 25% longer than that of H13, and the crack propagation rate is 30% lower than that of H13;
Excellent isotropy: multi-directional forging + ESR process, impact energy ratio in each direction ≥ 93%;
High temperature strength: 600 ℃ hardness > 300 HB, tensile strength ≥ 1200 MPa; Surface properties: Mirror polishing to Ra ≤ 0.05 μm (No.12,000 ~ 15,000); After nitriding, the surface hardness is ≥ 1000 HV, and the wear resistance is doubled;
Product application area
Area | Typical component | adaptation process parameter |
Die casting steel | aluminum/magnesium alloy cylinder block,sprue bushing | Hardness 46~48 HRC(recommend) |
Forging steel | Crankshaft/connecting rod forging die (≤ 400mm thick) | 1020 ℃ quenching, 44 ~ 52 HRC |
Extrusion tools | Aluminum extrusion cylinder, die cushion | 1030 ℃ quenching + 600 ℃ tempering |
High-end plastic mold | lamp and engine component injection mold | shall be polished to Ra ≤ 0.05 μm |
military components | aero-engine blade forging steel | high quality flaw detection grade (UT ≤ Φ1 mm) |
Packing and shipping
Generally, packing and transportation will be arranged according to the customer's requirements, whether to pack and arrange the appropriate mode of transportation, vehicles, such as whether to directly load and transport, whether to pack steel belts, whether to pack and spray marks, etc.





Keywords:
8418
FAQ
Q How should I choose the right die steel material for my die?
Ans: There are several key factors to consider when selecting a die steel, including: Mold use: injection molding? Die casting? Stamping? Cold work? Hot work? Processing material: plastic type (including glass fiber?) , metal type, yield requirements. Performance requirements: wear resistance, toughness, corrosion resistance, high temperature strength, polishing, dimensional stability. Budget: The price of different material grades varies greatly. Processing conditions: working temperature, stress, cooling mode. Suggestion: Provide as much detail as possible about the application of the die, or contact our technical sales team directly, and we will recommend the most suitable material grade according to your specific needs.
Q Is the die steel provided by you genuine? How to ensure the quality of materials?
Ans: Yes, the die steel we provide is produced and processed independently. We have long-term cooperation with first-line brands at national and abroad to ensure that all materials are genuine. We provide a complete original warranty (material certificate), including key data such as chemical composition and physical properties. We will also carry out strict factory re-inspection of some materials to ensure that the quality meets the standards.
Q The price of die steel fluctuates greatly. What are the main factors affecting the price?
Ans: The price of die steel is mainly affected by the following factors: Raw material cost: market price fluctuation of alloy elements (such as chromium, molybdenum, vanadium, tungsten, etc.). Production process: ESR, VD/VAR and other special processes increase the cost. Grade and brand of material: The price of material with high performance and famous brand is higher. Specifications and sizes: Premium prices may apply for special sizes, large sizes, or small quantities. Market supply and demand: changes in supply and demand in global and regional markets. Processing state: the price of pre-hard state (such as P20, 718, NAK80, etc.) Is higher than that of annealed state. We will provide a transparent and reasonable quotation according to the market situation.
Q What is time for delivery?
Ans: The delivery time depends on: Material inventory status: Common brands and specifications We usually have in stock, can achieve faster delivery (for example: 1-3 working days). Material specification and status: special size, uncommon brand or special treatment (such as pre-hardening, deep processing) may need to be ordered, the cycle is relatively long (for example: 1-6 weeks). Order size: Large orders may require coordinated production scheduling. Please tell us your specific requirements (brand, specification, status, quantity) at the time of inquiry, and we will provide the most accurate delivery information.
Q Can you provide heat treatment or processing services after the purchase of die steel?
Ans: Yes, we provide complementary professional services: Heat treatment: With professional heat treatment equipment (vacuum quenching, cryogenic treatment, tempering, etc.) And strict process control, we can provide customers with precise heat treatment services (according to material brand and hardness requirements). Finish machining: We can provide precision machining services such as milling, grinding (surface grinding, internal and external grinding), wire cutting, EDM, etc. According to customer's drawings. Please provide your specific needs (drawings, technical requirements), and we will evaluate and provide quotations and service programs.
Q The mold cracks and wears too fast during use. What are the possible reasons? Is it related to the material?
Ans: The causes of mold failure are complex and diverse, which may be related to materials, but also involve many links such as design, processing, heat treatment, service conditions, etc.: Material factors: improper selection of materials (performance does not match the working conditions), internal defects of materials (inclusions, segregation), counterfeit and shoddy materials. Heat treatment factors: Improper process leads to poor structure, uneven hardness and excessive residual stress. Design/processing factors: stress concentration, poor surface roughness, too deep tool marks. Usage factors: overload, insufficient lubrication, poor cooling, improper maintenance. Suggestion: In case of failure, please provide detailed information as much as possible (material grade, heat treatment status, photos of failure location, description of working condition). Our technical team can assist you in preliminary analysis to determine whether it is related to the material or provide suggestions for improvement.
Q Do you have a minimum order quantity (MOQ) requirement for your die steel products?
Ans: For the stock of conventional grades and specifications, we usually do not have strict MOQ restrictions, and can be purchased according to the actual needs of customers. For materials requiring special orders (such as unusual grades, special sizes, customized heat treatment/processing), Certain MOQ requirements may be set to ensure the economy of production, usually a minimum of 8 tons. Please consult our sales staff for specific MOQ before placing an order.
Q In addition to standard grades, can you offer special die steels with custom compositions?
Ans: We mainly deal in standard grades of die steel, which are widely proven to meet the needs of most applications. For the development of customized alloys with special performance requirements, this usually involves a large amount of R & D investment and production coordination, which is costly and takes a long time. We recommend that priority be given to the material closest to the demand from among the existing mature grades, or to meet special requirements by optimizing the heat treatment and surface treatment. If there is a need for customization, please specify the technical requirements and we will evaluate the feasibility.
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