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Assab Steels CARMO Cold Work Steel

Category Metal , Ferrous Metal , Chrome-moly Steel , Tool Steel , Cold Work Steel
Manufacturer Assab Steels
Trade Name
Port Ningbo port,China
Trade Terms FOB, CFR, CIF
Payment Terms L/C, T/T, Western Union
Download PDF Assab Steels CARMO Cold Work Steel.pdf
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Material Notes:
CARMO is a high-strength, flame-induction and through hardening steel delivered prehardened to 240-270 HB.The surface of the steel can be flame-hardened without water cooling to a hardness of 58±2 HRC. The depth of hardness is normally 4-5 mm and the hardened and tempered matrix is a good base for the flame-hardened layer. The steel can be easily repair welded and has a high wear resistance similar to that of A2. The toughness of CARMO is much better than that for the steel types A2 and D2. CARMO is a cold work tool steel which has been developed together with the automotive industry. Its analysis has been balanced to give one universal tool steel for car body dies instead of the several steel grades (flame hardening and through hardening grades) which are normally used. The steel can be used in the flame-hardened or in the through-hardened condition for blanking and forming of both car body parts (thin sheet) or structural parts (thicker sheet).
Mechanical Properties Metric English Comments
Hardness, Rockwell C 43
43
Surface hardness. 600°C Tempering temperature, T<sub>A</sub> = 960°C
55
55
Surface hardness. 400°C Tempering temperature, T<sub>A</sub> = 960°C
58
58
At 900°C Austenitizing temperature during hardening
60
60
Core hardness in air cooling for a diameter of 100 mm.
62
62
Core hardness in air cooling for a diameter of 50 mm.
63
63
At 960°C Austenitizing temperature during hardening
63
63
Surface hardness. 100°C Tempering temperature, T<sub>A</sub> = 960°C
63
63
Core hardness in air cooling for a diameter of 1-20 mm.
65
65
At 1025°C Austenitizing temperature during hardening
Tensile Strength, Ultimate 870 MPa
126000 psi
R<sub>m</sub>, @RT, 270 HB.
Tensile Strength, Yield 670 MPa
97200 psi
R<sub>p</sub>0.2, @RT, 270 HB.
Elongation at Break 15 %
15 %
Reduction of Area 50 %
50 %
Impact Test 125 J
92.2 ft-lb
RT. 450°C tempering temp. Specimen size: 7x10x55 mm unnotched. Hardened at 960°C. Quenched in air. Tempered twice
200 J
148 ft-lb
RT. 250°C tempering temp. Specimen size: 7x10x55 mm unnotched. Hardened at 960°C. Quenched in air. Tempered twice
260 J
192 ft-lb
RT. 600°C tempering temp. Specimen size: 7x10x55 mm unnotched. Hardened at 960°C. Quenched in air. Tempered twice
Thermal Properties Metric English Comments
CTE, linear 12.3 µm/m-°C

@Temperature 20.0 - 200 °C
6.83 µin/in-°F

@Temperature 68.0 - 392 °F
Hardened and tempered to 56 HRC
13.3 µm/m-°C

@Temperature 20.0 - 400 °C
7.39 µin/in-°F

@Temperature 68.0 - 752 °F
Hardened and tempered to 56 HRC
Component Elements Properties Metric English Comments
Carbon, C 0.60 %
0.60 %
Chromium, Cr 4.5 %
4.5 %
Iron, Fe 93.05 %
93.05 %
Manganese, Mn 0.80 %
0.80 %
Molybdenum, Mo 0.50 %
0.50 %
Silicon, Si 0.35 %
0.35 %
Vanadium, V 0.20 %
0.20 %
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