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详细介绍

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Device parameters

Chemical composition and properties of die steel

sequence

number

Material designation

Chemical composition ( % )

annealing

Hardness HB

Tempering hardness HRC

With

To the

5CrNiMo

0.50-0.60

≤ 0.40

0.50-0.80

0.15-0.30

≤ 0.025

1.40-1.80

≤ 0.20

197-241

53-58

H13

0.32-0.45

0.80-1.20

0.20-0.50

4.75-5.50

1.10-1.75

≤ 0.025

0.80-1.20

≤ 0.20

≤ 235

≥ 60

1.40-1.60

0.10-0.60

0.20-0.60

11.0-13.0

0.70-1.20

≤ 0.025

0.50-1.10

≤ 0.20

≤ 255

≥ 59

718

0.32-0.40

0.20-0.80

1.00-1.50

1.70-2.00

0.25-0.40

≤ 0.025

0.85-1.15

≤ 0.20

Pre-hardened 30-35 HRC

Hardened 35-40 HRC

4Cr13

0.36-0.45

≤ 0.60

≤ 0.80

12.0-14.0

≤ 0.025

≤ 0.20

≤ 201

≥ 50

4Cr16Mo

0.33-0.43

≤ 1.00

15.0-17.0

1.00-1.30

≤ 0.025

≤ 0.20

≤ 250

≥ 49

NAK 80

0.05-0.18

0.15-1.00

1.0-2.0

0.20-0.40

≤ 0.025

2.30-3.50

0.70-1.50

0.50-1.50

37-43HRC

Hard aging

Without quenching

XFP 80

0.12

1.80

0.30

≤ 0.025

3.0

1.0

37-43HRC

Hard aging

Without quenching

Technical requirements for die steel

1. The allowable deviation of the chemical composition of steel should meet the requirements of GB222-84. The smelting method of electric furnace + vacuum refining or vacuum refining + electroslag remelting shall be specified in the contract.

2. The die steel adopts the GB/T6402-1991 standard for ultrasonic flaw detection, and the result shall not have dense defects larger than the equivalent diameter of Ø2mm. A single scattered metallurgical defect is allowed, of which no more than 3 of the equivalent diameter of Ø2-3mm, and only one of the equivalent diameter of Ø3-4 are allowed.

Mold steel grades, varieties, performance characteristics and uses

Serial number	category	Grade	Executive standard	Similar grades	Available varieties	Performance characteristics and uses
1	Low alloy hot work die steel	5CrNiMo	GB11880-89 GB/T1299-2000	55NiCrMoV6 (Germany ) , SKT4 ( Japan ) , 5XHM ( Russia ) , L6 ( AISI/ASTM ), 55NiCrMoV2 ( ISO ), 55NiCrMoV7 (EN)	Module Forging Forging	Has good toughness, strength, high wear resistance and hardenability. The mechanical properties at room temperature and 500-600 ℃ are almost the same. When heated to 500℃, the hardness can still maintain 300HB. It is used to manufacture various medium-sized forging dies with simple shapes and thicknesses of 250-300mm, and also used for trimming dies. The steel is easy to form white spots, which requires strict control of the smelting process and cooling after forging
2	Medium alloy hot work die steel	4Cr5MoSiV1	GB/T1299-2000	H13(AISI/ASTM681-2008), BH13 (UK ) , 8402 (Sweden), SKD61 (Japan JICS4404-2000)	Module Forged round steel Forged flat steel	It is an air-cooled hardened hot work die steel, and is one of the most widely used steel grades of hot work die steel. It has good thermal strength and certain wear resistance, air quenching under the condition of lower austenitizing temperature, heat treatment deformation is small, the tendency of oxide scale produced during air quenching is small, and it can resist the erosion effect of molten aluminum. The steel is used to manufacture extrusion dies, mandrels, forging dies for forging hammers, forging press dies, precision forging machine inserts, and copper and aluminum alloy die casting dies
3	High alloy cold work die steel	Cr12Mo1V1	GB/T1299-2000	D2(AISI/ASTM618-2008), BD2 (UK ) , X155CrMoV12-1 ( Germany ) , SKD11 (Japan JICS4404-2000) , SVERKER21 ( Sweden ) , K110 (Austria ) , 160CrMoV (ISO)	Module Forging	It is a high-carbon and high-chromium cold work die steel widely used internationally and belongs to ledeburite steel. After years of practice, it has been proved that the performance of Cr12Mo1V1 is better than that of Cr12MoV . Because the steel has higher Mo and V content than Cr12MoV steel, and contains Co, the structure of the steel is improved, and its strength and toughness and wear resistance are improved. Japan's SKD11 composition is between China's Cr12Mo1V1 and Cr12MoV , but it contains V without Vand does not contain Co. However, Japan treats SKD11 as D2 . Cr12Mo1V1 and Cr12MoV have the same purpose, used for more demanding mold parts, extrusion dies, stamping dies, forming rolls, and also used for high wear resistance plastic molds
4	Pre-hardened plastic mold steel	3Cr2NiMo 3Cr2NiMnMo	GB/T1299-2000 YB/T094-1997	718 (Swedish ASSAB company ) , P20+Ni (Sweden ) , PX4/PX5 ( Japan ) , GS-318 (Germany ) , SWP20 ( Shanghai No. 5 Steel ) , CS718 (China Great Wall Special Steel )	Module Forged round steel Forged flat steel	Its comprehensive mechanical properties and high hardenability can make large cross-section steels have a more uniform hardness distribution after quenching and tempering. When making molds, the steel is generally advanced in quenching and tempering, with a hardness of 28-38HRC , and then processed into molds that can be used directly, which not only guarantees the use performance of large or extra-large molds, but also avoids mold deformation caused by heat treatment. The steel is easy to manufacture extra large. Large plastic molds, can also be used for die-casting molds of low melting point alloys
5	Corrosion-resistant plastic mold steel	4Cr13	YB/T094-1997	X39Cr13 (ISO, EN) X38Cr13 (Germany ) , Z40C14 ( France )	Round bar flat steel Fang Gang	It belongs to the martensitic stainless steel. The steel has good machining performance. After heat treatment, it has excellent corrosion resistance, polishing performance, high strength and wear resistance, and is suitable for manufacturing with high load and high wear resistance in corrosive media Under the action of plastic abrasive tools and transparent plastic product molds. But the solderability is poor, and you must pay attention to it when using it
6	Corrosion resistant plastic mold steel	4Cr16Mo	Shanghai No. 5 Steel	CLC2316H (France), GWS-2316, X38CrMo16 1 ( DIN )	Round bar flat steel Fang Gang	It belongs to the martensitic stainless steel , which has excellent corrosion resistance, high mechanical strength and wear resistance, good processing technology, and excellent mirror polishing. Suitable for corrosion-resistant plastic molds, PVC pipe fitting molds, profile extrusion molds, and plastic molds that require mirror finish
7	Pre-hardened plastic mold steel	NAK80 (Japan)	Daido Steel	P21 optimization (United States)	Module Plank	Without heat treatment, polishing excellent optical properties , machinability,Etched good.In solution treatment, the mold or workpiece is heated to600 ℃ to preheat, then heated to 840-900 ℃ for a certain period of time (at least 2 hours), then air-cooled to room temperature, the hardness after solution is 29-32HRC . After finishing the mold, the hardness can reach 37-43HRC after aging treatment . It has excellent mirror polishing properties, suitable for making high-precision mirror molds,high-efficiency blanking molds, punching molds and impression molds, various scissors, inlaid blades, woodworking blades, thread rolling molds and wear-resistant sliders, cold heading molds, Thermosetting resin molding die, deep drawing molding die, cold extrusion die.
8	Plastic mold steel	XFP80	Xiongfeng Company	P21 optimization (United States), NAK 80 (Japan)	Module Plank	Solution and aging treatment without quenching. Excellent polishing and etching properties, suitable for liquid crystal display templates, and high-quality plastic molds with a smooth surface