H13 Hot work tool steel, DIN 1.2344, ASTM A681, SAE J467, UNS T20813

Description

H13 tool steel Other equivalent international grades are given below to include:

• DIN 1.2344
• UNS T20813
• AFNOR Z 40 COV 5
• UNI KU
• SS 2242
• SAE J437
• SAE J438
• JIS SKD61
• B.S. BH 13
• FED QQ-T-570
• SAE J467
• ASTM A681
• AMS 6408

1. CHEMICAL COMPOSITION of H13 TOOL STEEL/ DIN 1.2344 STEEL :

Standard	Grade	C	Si	Mn	P	S	Cr	Mo	V
ASTM A681	H13	0.32-0.45	0.8-1.2	0.20-0.50	0.03	0.03	4.75-5.50	1.1-1.75	0.8-1.2
GB/T 1299	4Cr5MoSiV1	0.32-0.42	0.8-1.2	0.2-0.5	0.03	0.03	4.75-5.5	1.1-1.75	0.8-1.2
JIS G4404	SKD61	0.35-0.42	0.8-1.2	0.25-0.5	0.03	0.03	4.8-5.5	1-1.5	0.8-1.15
DIN ISO 4957	1.2344	0.37-0.42	0.9-1.2	0.3-0.5	0.03	0.03	4.8-5.5	1.2-1.5	0.9-1.1

 

2. PHYSICAL PROPERTY:

Temperature	20°C	400°C	1110°C
Density，g/cm3	7.8	7.7	7.6
Coefficient of thermal expansion，per °C from 20°C	—	12.6 x 10^–6	13.2 x 10^–6
Modulus of elasticity，N/mm2	210000	180000	140000
Thermal conductivity，W/m °C	25	29	30
Melting point	1427°C	1427°C	1427°C
Specific Gravity	7.75	7.75	7.75
Machinability	65-70% of a 1% carbon steel	65-70% of a 1% carbon steel	65-70% of a 1% carbon steel

 

3. MECHANICAL PROPERTY:

Tempering Tem. ℃	After quenched	200	400	500	520	550	580	600	650	700
Hardness HRC	56	54	54	55.5	54	52.5	49	45.5	33	28
Tensile Strength Mpa	—	—	2040	2100	2080	1980	1780	1650	1180	—
Reduction of area	—	—	40	34	40	48	53	54	55	—
Elongation %	—	—	11	11	11.5	12	12.5	14	18	—
Impact J	—	—	40	32	35	50	60	70	100	—

 

4. FORGING:

H13 with two steps, first heat the temperature to 750 ^oC – 800 ^oC, hold for a suitable time, then heat the temperature up to 1050 ^oC – 1100 ^oC, hold enough time for the steel to be thoroughly heated. Reheat is necessary when the temperature below 950^oC.H13 steel should be cooled as slowly as possible in the furnace. Annealing is always required after forged.

 

5. HARDENING:

Pre-heating temperature: 600–850°C, normally in two pre-heating steps.
Austenitizing temperature: 1020–1050°C, normally 1020–1030°C.

 

6. TEMPERING:

Tempering should be carried out immediately after quenching. Heat slowly and uniformly to the tempering temperature, soak well not less than 2 hours(one hour per 25mm of total thickness).

The usual tempering range is 530-650°C depending on the hardness requirements and the operating temperature of the tool.

Double tempering is strongly recommended, H13 should be cooled to room temperature between tempers.

Tempering within the range 425-550°C is not recommended due to the reduction in toughness properties.

 

7. APPLICATION:

H13 hot work tool steel has excellent properties and is widely used in hot work and cold work applications.

Typical applications include die casting dies for aluminium, magnesium and zinc, extrusion dies for aluminium and brass, liners, mandrels, pressure pads, followers, bolsters, die cases, die holders and adaptor rings for copper and brass extrusion.

H13 is used to produce hot stamping and press forge dies, split hot heading dies, gripper dies, hot punching, piercing and trimming tools.

Other applications include plastic moulds, shear blades for hot work and hot swaging dies.