Detailed Introduction
| Steel grade(Kor) |
Comparison of grades from various countries |
Technical conditions |
Chemical composition |
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C |
Cr |
Mo |
V |
S |
P |
Si |
Mn |
Ni |
W |
Al |
Cu |
Nb |
Co |
B |
| PST23F85 |
Japan Daido (GO5) Japan Hitachi (HM5)
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DIN EN ISO 4957-2001 |
0.80 ¦ 0.90 |
1.80 ¦ 2.20 |
0.20 ¦ 0.30 |
0.05 ¦ 0.10 |
≤0.010 |
≤0.030 |
0.80 ¦ 1.20 |
0.70 ¦ 1.10 |
≤0.25 |
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0.15 ¦ 0.20 |
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| Steel grade(GB) |
Comparison of grades from various countries |
Technical conditions |
Chemical composition |
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C |
Cr |
Mo |
V |
S |
P |
Si |
Mn |
Ni |
W |
Al |
Cu |
Nb |
Co |
B |
| 7CrSiMnMoV |
CH-1 |
GB/T 1299-2014 |
0.65 ¦ 0.70 |
0.90 ¦ 1.20 |
0.20 ¦ 0.50 |
0.15 ¦ 0.30 |
≤0.010 |
≤0.030 |
0.85 ¦ 1.15 |
0.65 ¦ 1.05 |
≤0.25 |
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PST23F85 It is a flame-quenched tool steel that undergoes surface heat treatment through flame. This heat treatment method can save costs while ensuring that the steel has high strength and surface wear resistance, mainly used for automotive bumper molds, punching molds, forming molds, cutting edge molds, and shear blades.
7CrSiMnMoV(HMD、CH-1)The steel is flame-quenched steel, used to manufacture large and complex cold work molds.7CrSiMnMoV(HMD、CH-1)The steel can be used for the mold cutting edgeparts, heated to quenching temperature by oxygen-acetylene flame, and then air-cooled to achieve hardening. It has small deformation and does not require further processing. Molds treated with flame quenching have a longer service life compared to carbon tool steel and low-alloy mold steel, and can shorten the mold production cycle by 10%, reduce costs by 10% to 20%, and save about 80% of energy in heat treatment, opening up new avenues for efficient, low-cost, and energy-saving die manufacturing processes.
Forging process
7CrSiMnMoV(HMD、CH-1)The steel has low alloy content, no large excess carbides, low plastic deformation resistance, and good forging performance. The forging heating temperatureis 1150 to 1200℃, starting forging temperature 1100 to 1150℃, ending forging temperature 800 to 850℃. Due to the good hardenability of the steel, the surface hardness after forging can reach 50HRC, so it should be air-cooled after forging.
Annealing process
To prevent decarburization,7CrSiMnMoV(HMD、CH-1)the annealing of the steel should be carried out in a protective atmosphere. The commonly used annealing process is to hold at820 to 840℃ and then slowly cool to about 550℃ at a cooling rate of 20 to 30℃/h, followed by air cooling. If a satisfactory granular pearlite structure is required, it can be slowly cooled to 680 to 700℃ after heating and holding, isothermally held for 3 to 6 hours, and then slowly cooled.
The annealing hardness is217 to 241HBS.
Quenching and tempering process
The recommended overall quenching and tempering process is:After holding at 900 to 920℃, oil quenching or graded quenching in 220℃ nitrate salt, tempering at 190 to 200℃ for 1 to 3 hours, hardness is 58 to 62HRC.
Flame quenching process:Flame heating and air cooling quenching can be performed using single or double nozzle flames to achievea hardness of 58HRC. When using a double nozzle, the hardened layer depth can reach 5 to 6mm; with a single nozzle, the hardened layer depth is generally 2 to 3mm.
Mechanical properties
Compared with commonly used mold steels9Mn2V, CrWMn, Cr12MoV,7CrSiMnMoV(HMD、CH-1)the steel has a significant advantage in toughness. Flame quenching can give the surface high hardness, high toughness in the core, and the mold is less likely to crack or chip, while the surface hardened layer forms compressive stress, which can significantly improve fatigue strength and extend the service life of the mold.
Application range
Using flame heating and quenching has advantages such as simple equipment, convenient operation, and high productivity, and solves the problem of local quenching of large molds.CH-1 steel has been widely used in standard parts, bearings, electronics, automotive and other industries. Replacing T10A, 9Mn2V, CrWMn, Cr12MoV steel with CH-1 steel to manufacture cold work molds such as blanking molds, punching molds, trimming molds, bending molds, shaping molds, deep drawing molds, and cold heading molds, which have higher toughness requirements, can increase the lifespan by more than 1 to 3 times.
key word:
Hot working mold steel
Cold working mold steel
Plastic mold steel
Forging series
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