Ultra-high thermal conductivity hot stamping die steel and manufacturing method thereof

Abstract

The invention relates to an ultra-high thermal conductivity hot stamping die steel and a manufacturing method thereof, the ultra-high thermal conductivity hot stamping die steel comprises the following alloy elements by mass: 0.40-0.50% of C;<=0.30% of Si;<=0.30% of Cr; 0.80-1.5% of Mn; 0.80-1.50% of Ni; 1.30-2.0% of Mo; 1.30-2.0% of V; trace amount of B; and balance of Fe and others unavoidable impurities. The manufacturing method comprises electric furnace smelting + vacuum refining + electroslag remelting, electroslag ingots with uniform composition can be smelted, stress relief annealing of the electroslag ingots is performed; forging forming is performed, then water cooling and spheroidizing annealing are performed after the forging forming; and finally, high temperature quenching andmultiple times of high temperature tempering are used to obtain the hot stamping die steel with excellent impact toughness, tempering stability and high thermal conductivity.

Description

technical field

[0001] The invention belongs to the technical field of alloy steel manufacturing technology, and relates to an ultra-high thermal conductivity hot stamping die steel and a manufacturing method thereof. Background technique

[0002] With the increasing energy crisis and environmental problems, automobile lightweight has become an inevitable path for the sustainable development of the world's automobile industry. The high reinforcement of the body can not only reduce the weight of the body, but also improve the safety. It is the best way to realize the weight reduction of the body and improve the collision safety at the same time.

[0003] In order to meet the development needs of high-strength car body, advanced high-strength steel and advanced parts forming technology came into being. Advanced high-strength steels such as TRIP steel and TWIP steel are widely used in the manufacture of auto parts below 1000MPa. However, when the strength reaches above 1000MP...

Examples

Embodiment

[0027] In the embodiment, the chemical composition of each grade of steel of 1-3 is shown in Table 1:

[0028] Table 1 embodiment 1-3 chemical composition

[0029] Example

C

Si

Cr

mn

Ni

Mo

V

B

S

P

1

0.43

0.22

0.24

0.95

1.0

1.55

1.61

trace

0.002

0.007

2

0.48

0.24

0.26

1.42

1.12

1.82

1.72

trace

0.002

0.007

3

0.45

0.19

0.22

1.00

1.5

1.30

1.64

trace

0.002

0.008

[0030] The steps of manufacturing ultra-high thermal conductivity hot stamping die steel are as follows:

[0031] Step 1), electrode billet smelting: batching is carried out according to the chemical composition and its mass percentage in the examples, smelting is carried out in an eccentric electric arc furnace, the intermediate frequency furnace alloy is blended into a refining furnace, refined outside the furnace, and cast into an electrode billet.

[0032] Step...

technical field

[0001] The invention belongs to the technical field of alloy steel manufacturing technology, and relates to an ultra-high thermal conductivity hot stamping die steel and a manufacturing method thereof. Background technique

[0002] With the increasing energy crisis and environmental problems, automobile lightweight has become an inevitable path for the sustainable development of the world's automobile industry. The high reinforcement of the body can not only reduce the weight of the body, but also improve the safety. It is the best way to realize the weight reduction of the body and improve the collision safety at the same time.

[0003] In order to meet the development needs of high-strength car body, advanced high-strength steel and advanced parts forming technology came into being. Advanced high-strength steels such as TRIP steel and TWIP steel are widely used in the manufacture of auto parts below 1000MPa. However, when the strength reaches above 1000MP...

Examples

Embodiment

[0027] In the embodiment, the chemical composition of each grade of steel of 1-3 is shown in Table 1:

[0028] Table 1 embodiment 1-3 chemical composition

[0029] Example

C

Si

Cr

mn

Ni

Mo

V

B

S

P

1

0.43

0.22

0.24

0.95

1.0

1.55

1.61

trace

0.002

0.007

2

0.48

0.24

0.26

1.42

1.12

1.82

1.72

trace

0.002

0.007

3

0.45

0.19

0.22

1.00

1.5

1.30

1.64

trace

0.002

0.008

[0030] The steps of manufacturing ultra-high thermal conductivity hot stamping die steel are as follows:

[0031] Step 1), electrode billet smelting: batching is carried out according to the chemical composition and its mass percentage in the examples, smelting is carried out in an eccentric electric arc furnace, the intermediate frequency furnace alloy is blended into a refining furnace, refined outside the furnace, and cast into an electrode billet.

[0032] Step...

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