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Product number
Chemical composition
Serial number
Chemical element
Content
Chemical element
Content
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Physical properties
The critical temperature of steel is shown in the table, and the linear expansion coefficient is shown in the table.
Critical temperature of table steel
Critical point
Temperature (approximate value)/℃
Linear expansion coefficient of table steel
Temperature/℃< br/>
~
~
~
(Expansion) expansion coefficient/℃
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Heat treatment process
After hammering, the general annealing heating temperature is 10°C, and the furnace is cooled to below 10°C. Air-cooled out of the oven, hardness after annealing.
The heating temperature of post-hammer isothermal annealing process, isothermal temperature, furnace cooling to temperature, air cooling out of the furnace, hardness, and annealing metallographic structure are all fine-grained pearlite + carbide.
After quenching and low-temperature tempering (~°C quenching oil, ~°C tempering), it contains carbides with a mass fraction of ~~ and retained austenite with a mass fraction of ~~. The tempering temperature is ~ degrees, the hardness is ~ Tempering is ~ degrees, the hardness is ~.
Typical Applications
Steel has a wide range of uses, manufacturing molds with high mechanical strength, requiring certain wear resistance and withstanding certain impact loads, such as drill bushings, cold stamping dies and punches, cutting heads, etc. Side dies, impression dies, thread rolling dies, thread rolling plates and block gauges, etc.
Processing
First critical temperature of steel
℃℃, ℃ ℃ ℃, ℃
Secondary thermal processing
Hot processing technology of steel
Steel ingot heating temperature/℃~open forging temperature/℃~final forging temperature/℃~slow cooling
Steel billet heating temperature/℃~open forging temperature/℃~final forging temperature/℃~slow cooling
Preparatory heat treatment
) Steel quenching specifications
Scheme 1 is used to manufacture workpieces with small deformation, such as thread rolling dies, thread rolling plates and molds with complex shapes that are subject to impact loads. The first preheating is ~ ℃, and the second preheating is Heat ~ ℃, final heating ~ ℃, continuous cooling fire, oil cooling to ~ ℃, hardness ~ .
The second option is for workpieces that require high wear resistance, such as manufacturing cutting tools (woodworking) and saw blades. The first preheating is ~ ℃, the second preheating is ~ ℃, and the final heating is ~ ℃, segmented quenching, nitrate, salt, etc. Alkali to ~ ℃, then air cooling ℃, hardness ~ ℃.
) Tempering specifications for steel
ⅠAfter quenching at ~℃, the heating medium oil is heated to ~holding time
Hardness~
ⅡAfter quenching at ~℃, the heating medium is nitrate salt Or alkali heating to ~ holding time
Hardness ~
ⅢAfter quenching at ~℃, temper the first time with nitrate salt, heat to ~℃, keep warm, temper for the second time with alkali or air furnace, heat to ~℃, keep warm, hardness.
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