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Mould Material S136
- Apr 05, 2018 -

Mould Material S136


S136 mold material by electroslag melting smelting with good cast optical activity (mirror processing) good wear resistance and toughness at high temperature with good plasticity because of its high chromium content (13.6%) so its corrosion resistance is excellent, pre-add hard corrosion-resistant mirror mold steel S136 is a mirror rust-proof mold steel.


Comparison of steel grades of S136 five countries

元素

C

Si

Mn

Cr

P

S

含量(%)

0.38

0.8

0.5

13.6

<0.03

<0.03


Factory hardness

Annealing to 235HB


Characteristics


After the furnace refining (VD) + Electroslag remelting Refining (ESR), the organization of more pure fine, excellent corrosion resistance, polishing, good wear resistance, mechanical processing, hardening of the excellent dimensional stability.


Use


High degree of polishing and high requirements of the internal mold, corrosion-resistant plastic molds, production, medical, food industry and other products.


S136 Advantages


S136 is a plastic mold steel with excellent corrosion resistance, and has excellent production characteristics, and has the following advantages:
Lower maintenance Costs: After long-term use of the mold, the surface of the cavity still maintains its original smooth state. When the mold is operated or stored in a humid environment, no special protection is required.


Lower production costs:

Mold does not because of the impact of cooling water corrosion, due to a certain cooling cycle, can increase the die life.

模具材料

The above benefits, combined with S136 's high corrosion resistance, provide low maintenance costs and high life-span molds to achieve optimal economic benefits. At the same time, S136 through Electroslag remelting (ESR) refining, with pure and fine tissue, so that the mold has a good comprehensive mechanical properties, high polishing performance.


USE

S136 can be used with all molds, due to their special nature, more suited to the needs of special environments.

Corrosion resistance and strain resistance:

For the use of corrosive PVC acetic acid salts (ACETATES0) and other injection molding materials or molds must be in a humid environment to work and storage, S136 can resist the water vapor, weak organic acids, nitrate, carbonate and other corrosive effects, through the S136 made of molds, if in a humid environment operation, Or in the normal state of the use of corrosive plastic materials, will not rust and be contaminated. If tempering to 250 ℃ and polished into a mirror state, especially can show excellent corrosion resistance.


Wear resistance:

The use of friction larger injection molding materials (including injection molding) or require a longer working time mold, such as electronic components, discarded meal knives, utensils and so on.

High Finish Surface:

Production of optical products, such as cameras, sunglasses, chemical instruments, syringes, analytical instruments and plastic products.

S136 Features:

Physical

After hardening the material, the hardness tempering to 50HRC, at room temperature and high temperature data.

温度

20

200

400

密度Kf/m&sup3;

7850

7800

7700

弹性系数N/mm&sup2;

216*10&sup3;

211*10&sup3;

191*10&sup3;

热膨胀系数自20℃起

11*10&shy;&shy;_6

11.4*10_6

热传导系数W/m℃

16.5

21.5

23.5

比热J/Kg℃

461

-

Tensile strength

Test materials for the diameter of 25mm round rods, after 1025 ℃ quenching and two tempering, the results under different hardness, such as said:

硬度HRC

55

50

45

抗拉强度N/mm&sup2;

2051

1782

1430

0.2%硬度N/mm&sup2;

1610

1460

1280

断面收缩率(%)

26

29

40

伸长率(%)

8

10

12

Welding

Usually tool steels should avoid welding as much as possible because of the easy cracking.

If the preparation before welding, such as in the welding site preheating, it is easier to succeed, after welding must immediately take the following steps:

1, the elimination of stress-materials in the soft annealing state welding, you must do stress elimination.

2, tempering-the material in the quenching-tempering condition when welding, must do tempering treatment.

Heat treatment

Annealing

In a protected state, heat up to 780 ℃ and then cool to 650 ℃ in the furnace at 10 ℃ per hour and then cool in the air.

Stress elimination

After roughing, must be heated to 650 ℃, both hot 2 hours, slowly cooling to 500 ℃, and then cooling in the air.

Hardened

Preheating Temperature: 600-850 ℃

Quenching temperature: 980-1050 ℃

温度(℃)

保持时间(min

回火前硬度(HRC

980

40

52±2

1025

30

56±2

1050

20

57±2

均热时间,以钢材中心达到淬硬温度开始计算,淬硬时必须保护,以避免脱碳及氧化



Quenching medium

Oil

In the 200-550 ℃ salt bath furnace medium temperature quenching, and then cooling in the air.

Compressed air

Circulating air or atmosphere

Grinding

The correct grinding technology can avoid cracks and increase tool life. If the material is grinded under low temperature tempering, it becomes very sensitive during grinding, only the soft and open grain grinding wheel can be used and must have good coolant.

Polishing

The S136 has excellent polishing performance in the condition of hardening and tempering.

1, the use of particle size 180-320 grinding wheel or grinding to do preliminary grinding.

2, using a particle size of 400-800 sandpaper or powder grinding.

3, use diamond paste with granularity 12.6 and 3μm, and polishing fiber mat.

Light etching carving

The S136 is very evenly organized and contains very few impurities, which is suitable for etching and engraving.