Alloy Tool Steel

SKS, SKD and SKT Series

Alloy tool steel is a type of steel in which alloy elements such as chromium, molybdenum, tungsten, and vanadium are added to the carbon tool steel to improve hardenability , toughness, wear resistance, and heat resistance . It is mainly used to manufacture measuring tools, cutting tools, impact-resistant tools, cold and hot molds and some special-purpose tools. In the carbon tool steel added Si, Mn, Ni, Cr, W, Mo, V , etc. alloying elements in the steel . Adding Cr and Mn can improve the hardenability of tool steel , and other elements can be selectively added or added at the same time (the total amount is generally not more than 5%) to form a series of alloy tool steel.

 

Product Applications

Alloy tool steel is widely used as cutting tools , cold and hot deformation molds and measuring tools . It can also be used to make diesel fuel pump pistons, valves, valve seats and fuel valve nozzles .

SKD11

SKD11 is of high carbon, high Cr. alloy steel and features e

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SKD11

SKD11 is of high carbon, high Cr. alloy steel and features extremely high hardness.
Heat treatment conditions:
Annealing: 830-880 Slow cooling
Quenching: 1000-1050 Air cooling (980-1030 oil)
Tempering: 150-250 Air 冷

Mechanical properties:
Annealing hardness: HRC 20 or less
Applied hardness (quenching + tempering): HRC 58 or more

Application:
This steel is easy to turn, and it is suitable to make sharp blades, scissors, circular saws, cold or hot work trimming dies, drum edges, screw threads, wire dies, milling cutters, punching machine dies, round drums, power transformer core punching dies, Cutting steel strip knives, steel pipe forming rollers, jeweller rollers, special forming rollers, precision gauges, cold pressing tools with various shapes, mandrels, metallurgy, tin molds, plastics, screw heading molds, etc.

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SKD61

SKD61 is used for hot-works, punch dies and thermal forming

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SKD61

SKD61 is used for hot-works, punch dies and thermal forming dies. It contains elements Cr., Mo., V...etc. to get good toughness, wear-resistance and heat-fatigue resistance. So, it can resist against harsh temp. varying environment for long time and refrain the material from deformation.

Heat treatment conditions:
Annealing: 820~870℃
Quenching: 1000~1050℃ Room temperature air cooling
tempering: 550~650℃ Room temperature air cooling
nitrogen treatment: 480~650℃

Application:
Can withstand the corrosion of molten aluminum, magnesium, zinc The color of function and heat change drastically, suitable for manufacturing aluminum, magnesium, zinc alloy die-casting die, aluminum extrusion hot hammer or hot stamping work, plastic mold and hot work reamer, rolling knife, grooving knife, scissors and hot forging punch, etc.

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SKS51

S2

S2 is very superior impact-resistance and tool steel, which

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S2

S2 is very superior impact-resistance and tool steel, which has been applied to the fabrication of screw-tap, hex wrench, and pneumatic screw drivers due to its outstanding toughness and general mechanical performances.

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Steel data

Standard Code Spec No. Material No. Mark
JIS G4404 SKS3
CNS 2965 SKS4
JIS G4404 SKS4
CNS 2965 SKS31
JIS G4404 SKS31
CNS 2965 SKS41
JIS G4404 SKS41
ASTM A681 S1
ASTM A681 S2
JIS G4404 SKD4
JIS G4404 SKD5
CNS 2965 SKD11
JIS G4404 SKD61
ASTM A681 H13
DIN 17350 1.2344 X40Cr-Mo5-1
CNS 2965 SKD62
JIS G4404 SKD62
JIS G4404 SKT4
ASTM A681(S-7) S7
AISI S7
(C)% (Si)% (Mn)% (P)% (S)% (Ni)% (Cr)% (Mo)% (Cu)% (W)% (V)% Ni+Cu Annealing(HB) Quenching(HRC)
0.9~1 ≦ 0.35 0.9~1.2 ≦ 0.03 ≦ 0.03 ≦ 0.25 0.5~1 ≦ 0.25 0.5~1 ≦ 217 ≧ 60
0.45~0.85 ≦ 0.35 ≦ 0.5 ≦ 0.03 ≦ 0.03 0.5~1 ≦ 0.25 0.5~1 ≦ 201 ≧ 56
0.45~0.55 ≦ 0.35 ≦ 0.5 ≦ 0.03 ≦ 0.03 0.5~1 ≦ 0.25 0.5~1 ≦ 201 ≧ 56
0.95~1.05 ≦ 0.35 0.9~1.2 ≦ 0.03 ≦ 0.03 ≦ 0.25 0.9~1.1 ≦ 0.25 1~1.3 ≦ 217 ≧ 61
0.95~1.05 ≦ 0.35 0.9~1.2 ≦ 0.03 ≦ 0.03 ≦ 0.25 0.9~1.1 ≦ 0.25 1~1.3 ≦ 217 ≧ 61
0.35~0.45 ≦ 0.35 ≦ 0.5 ≦ 0.03 ≦ 0.03 ≦ 0.25 1~1.5 ≦ 0.25 2.5~3.5 0.15~0.3 ≦ 217 ≧ 53
0.35~0.45 ≦ 0.35 ≦ 0.5 ≦ 0.03 ≦ 0.03 ≦ 0.25 1~1.5 ≦ 0.25 2.5~3.5 0.15~0.3 ≦ 217 ≧ 53
0.4~0.55 0.15~1.2 0.4~0.4 ≦ 0.03 ≦ 0.03 1~1.8 ≦ 0.5 1.5~3 0.15~0.3 ≦ 207 ≧ 64
0.4~0.55 0.9~1.2 0.3~0.5 ≦ 0.03 ≦ 0.03 0.3~0.6 ≦ 0.5 ≦ 217 ≧ 58
0.25~0.35 ≦ 0.4 ≦ 0.6 ≦ 0.03 ≦ 0.02 ≦ 0.25 2~3 ≦ 0.25 5~6 0.35~0.5 ≦ 235 ≧ 42
0.25~0.35 0.1~0.4 0.15~0.45 ≦ 0.03 ≦ 0.03 ≦ 0.25 2~3.2 ≦ 0.25 9~10 0.35~0.5 ≦ 241 ≧ 48
1.4~1.6 ≦ 0.4 ≦ 0.6 ≦ 0.03 ≦ 0.03 ≦ 0.5 11~13 0.8~1.2 ≦ 0.25 0.2~0.5 ≦ 255 ≧ 58
0.32~0.42 0.8~1.2 0.2~0.5 ≦ 0.03 ≦ 0.03 ≦ 0.25 4.5~5.5 1.1~1.75 ≦ 0.25 0.8~1.15 ≦ 229 ≧ 50
0.32~0.45 0.8~1.2 0.2~0.5 ≦ 0.03 ≦ 0.03 4.75~5.5 1.1~1.75 0.8~1.2 ≦ 235 ≧ 52
0.37~0.42 0.9~1.2 0.3~0.5 ≦ 0.03 ≦ 0.03 4.8~5.5 1.2~1.5 0.9~1.1 ≦ 235
0.32~0.42 0.8~1.2 0.2~0.5 ≦ 0.03 ≦ 0.02 ≦ 0.25 4.5~5.5 1~1.5 ≦ 0.25 1~1.5 0.2~0.5 ≦ 229 ≧ 48
0.32~0.46 0.8~1.2 ≦ 0.5 ≦ 0.03 ≦ 0.02 ≦ 0.25 4.5~5.5 1~1.5 ≦ 0.25 1~1.5 0.2~0.5 ≦ 229 ≧ 48
0.5~0.6 0.1~0.4 0.6~0.9 ≦ 0.03 ≦ 0.03 1.5~1.8 0.8~1.2 0.2~0.5 ≦ 0.25 ≦ 248 ≧ 42
0.45~0.55 0.2~1 0.2~0.9 ≦ 0.03 ≦ 0.03 3~6.5 1.3~1.8 ≦ 0.35 ≦ 0.75 ≦ 229 ≧ 56
0.45~0.55 0.2~1 0.2~0.9 ≦ 0.03 ≦ 0.03 3~6.5 1.3~1.8 ≦ 0.35 ≦ 0.75 ≦ 229 ≧ 56