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Cr2 Steel

Posted on 2015-01-09
(1) The characteristics of low-carbon tool steel alloy tool steel, chromium typical measuring and cutting steel. The steel is a comprehensive performance best water, one of the common cold work die steel quenching oil, and its chemical composition is equivalent to adding 1.5% Cr steel TlOA made. Its chemical composition and ball bearing steel GCr15 similar. Because it contains chromium, the steel hardenability, hardness, wear resistance than T10 high carbon tool steel, heat treated, quenched and tempered when the size will not change much. The steel containing less alloying elements, tempering resistance low, low hardenability, hardened layer shallow, and thus lower their carrying capacity. Ball complete the minimum heating temperature of 740 ℃, lamellar carbide heating temperature of 840 ℃.
The hardened steel hardness, high wear resistance, deformation hardening is small, but the difference between the high temperature ductility. The steel in quenching, thin die size trend inflation, general mold by oil quenching, increasingly shrinking size alkaline bath quenching, water quenching size trend inflation; using nitrate or hot oil quenching, bore trend inflation. Mold thickness less than 25mm can be oil quenching, size between 38 ~ 80mm available oil, alkali bath, salt or alkaline aqueous quench cooling; Mold thickness greater than 100mm.
And diameter greater than the cold heading die Ф25mm required pressurized water jet quenching.
When the steel in the vicinity of 250 ℃ tempered, because the residual austenite organizational changes, resulting in volume expansion, cavity tends to swell, this time, the solid showing peak fire bending strength, also showed a tempering effect brittleness However, the actual impact of the mold to be determined.
Surface decarburization layer also significantly increase the steel mill quench cracking and crack sensitive tendencies. The steel in oil critical quenching diameter Dc (oil) for Ф5-Ф25mm. Normalizing process can eliminate steel mesh and coarse pieces, spherical hybrid organization, improve hardenability.
The superfine steel after treatment process, and then the implementation of quenching, tempering, requiring hardness 59 ~ 60HRC, due to the non-notched impact toughness value of up to 15J / cm, so that the tool life increased by more than l times. The parts quenched hardness of 197 ~ 217HBS a fine ball body can ensure a good hardenability, but also effectively reduces the tendency of alkaline quenching crack.
Availability varieties: hot rolled sheet, forgings, cold-drawn material, hot-rolled steel, pull wire.
(2) Delivery status and annealed hardness, hardness of 179 ~ 229HI3S. Indentation diameter, 1.O ~ 4.5mm.
Chemical composition
(3) Standard GB 1299-85 steel (quality Lan fraction,%) C0.95 ~ 1.10, Si≤0.40, Mn≤0.40, P≤O.030, S≤O.030, Cr 1.30 ~ 1.65.
(4) Refer to the corresponding steel China GB standard steel Cr2, Taiwan CNS standard steel SUJ2, Japan JIS standard steel SUJ2, Americans STM / UNS standard steel L3, the US standard steel UNS T61203, International Organization for Standardization ISO standard steel 1OOCr2, German DIN standard steel l00Cr6, German DIN standard material number 1.2067, the French NF standard steel call Y100C6, Russia Г0CT standard steel X, British BS standard steel BL1 / BL3.
(5) critical point temperature (approx.) A = 745 ℃, A = 710 ℃, A = 900 ℃, M = 140 ~ 180 ℃.
(6) General softening rough specification cold temperature 820 ℃ ± 10 ℃, time 3 ~ 4h, to 5 ℃ / h cooling rate, slow cooling furnace cooling to cool to ≤650 "C, cooled baked.
(7) Normalizing specification
① Heating temperature of 900 ~ 920 ℃, holding time bath heaters 25 ~ 30s / mm, air furnace 70 ~ 90s / mm, air cooling, the hardness of 302 ~ 388HBS.
② heating temperature of 930 ~ 950 ℃, holding time bath heaters 25 ~ 30s / mm, air furnace 70 ~ 90s / mm, air cooling, the hardness of 302 ~ 388HBS.
(8) Specification annealing temperature 770 ~ 790 ℃, holding time 2 ~ 4h, to 30 ℃ / h cooling rate slow furnace cooling to a temperature of 500 ~ 600 ℃, then cooled baked.
(9) Isothermal ball annealing specification
① (790-720) ℃ × (2 ~ 3) h, furnace cooling, (700 ~ 720) ℃ × (3 ~ 4) h, then cooled baked. Hardness ≤229HBS, pearlite 2 to 5, mesh carbide grade ≤2.
② (770 ~ 790) ℃ × (2 ~ 4) h, furnace cooling, (680 ~ 700) ℃ × (4 ~ 6) h, furnace cooled to a temperature of 500 ~ 600 ℃, cooled baked. The hardness of 179 ~ 229HBS.
(10) cold isothermal ball softening rough specification (820 ± 10) ℃ × (3 ~ 4) h, with furnace cooling, (720 ± 10) ℃ × (6 ~ 8) h, followed by slow cooling to cool to ≤600 ℃, cooled baked. Hardness after treatment reduced by ≤229HBS ≤179HBS.
(11) Quenching quenching temperature specification 840 ~ 860 ℃, oil cooling, tempering temperature is 660 ~ 680 ℃, hardness 229HBS.
(12) Quenching and tempering specification quenching temperature 830 ~ 860 ℃, oil cooling, quenching hardness ≥62HRC; tempering temperature of 160 ~ 170 ℃ or 200 ~ 250 ℃.
(13) Typical application examples
1. Commonly used in cold rolling, roll.
2.ф30mm roll by heating the salt bath quenching, the hardness value of the pretreatment process blanks related. Original rough annealing quenching hardness 65 ~ 66.5HRC; withered quality blank quenching hardness 66 ~ 67HRC. And a high and uniform hardness, quench cracking phenomenon did not occur.
3. Use of the steel produced Die, die, and cold extrusion die refined using 160 ~ 180 ℃ tempered, good toughness.
4. The steel can be used as the bearing industry dies, cold heading die; in the metallurgical industry, for straightening profiles rolling die, drawing die, the better.
5. Use the carbide steel punch after fine processing, and then quenching and tempering to hardness 59-60HRC, its unnotched impact toughness value of up to 15J / cm, beyond the conventional treatment more than doubled, an increase die life times.
6. A variety of small batch production of Die, and the overall need to use cold heading die in the shell hardened state, punching tools.
7. Small molds martensitic quenching and isothermal quenching, high toughness.
8. Die size is also bigger.
9. Large, medium-sized mold using after quenching, the formation of shell hardening, good impact and fatigue resistance.
10. A method for the manufacture of measuring tools, such as model, gauge, gauge block, ring gauge, thread plug gauge, like columns, card board, sample sets.
11 Can also be used in the manufacture of cold heading wire drawing dies and molds cold mold.
12. Used for low-speed, take a small knife volume, processing material is not very hard cutting tools, such as turning, blades, cutters, reamers, etc.
13. Small and not very complicated plastic molds.
Next : CrW5 Steel
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