AISI T1 Steel Round Bar Sheet Plate, JIS SKH2, DIN 1.3355

T1 tool steel is a tungsten high speed steel. Its hardness, red hardness and the hardness at the high temperature are high, and it is easy to grind process. And it also is called JIS SKH2 and DIN 1.3355 steel. It can be used to process soft or medium hardness(300HB – 320HB or lower) materials. And it is the good material for high temperature wear-resistant mechanical parts. T1 Steel round bar sheet plate properties and heat treat as below.

T1 Steel Round Bar Sheet Plate Supply Range
Round BarDiameter: 12–220mm; Length: can be customized;
Other specifications can be customized.
Black Surface/Bright Surface/ Grinded/Peeled/Turned
As per given requirements.
Sheet/Plate/SlabThickness: 3-200mm; Width: can be customized;
Length: can be customized;
Other specifications can be customized.
Black Surface/Bright Surface/ Grinded/Peeled/Turned
As per given requirements.

T1 Steel Grade Equivalent Chart

Country USA Germany/UK/France JAPAN ISO
Standard ASTM A 600-92a EN ISO 4957-1999 JIS G4403: 2006 ISO 4957-1999
Grades T1 HS 18-0-1 SKH2 HS 18-0-1

T1 Steel Chemical Composition

STAND C(%) Mn(%) P(%) S(%) Si(%) Cr(%) V(%) W(%)
ASTM A 600-92a 0.65-0.80 0.10-0.40 ≤0.03 ≤0.03 0.20-0.40 3.75-4.50 0.90-1.30 17.25-18.75
EN ISO 4957-1999 0.73-0.83 ≤0.40 ≤0.030 ≤0.030 ≤0.45 3.80-4.50 1.00-1.20 17.20-18.70
JIS G4403: 2006 0.73-0.83 ≤0.40 ≤0.030 ≤0.030 ≤0.45 3.80-4.50 1.00-1.20 17.20-18.70
ISO 4957-1999 0.73-0.83 ≤0.40 ≤0.030 ≤0.030 ≤0.45 3.80-4.50 1.00-1.20 17.20-18.70

T1 Steel Physical Properties

Properties Metric Imperial
Density 8.67 g/cm³ 0.313 lb/in³

1.3355 Steel Mechanical Properties

Properties Metric Imperial
Hardness, Rockwell C 63.0 - 65.0 63.0 - 65.0
Poisson's ratio 0.27-0.30 0.27-0.30
Elastic modulus 190-210 GPa 27557-30457 ksi

T1 Steel Application

The application is decided by T1 steel chemical composition and properties. It is mainly used to make complex blades and impact-resistant metal cutting tools. It can also manufacture high-temperature bearings and cold extrusion dies. It also is used to make gear tools, milling tools, and tools such as punches, cutters and etc.

T1 Steel Characteristics

It is a tool steel with high hardness, high wear resistance and high heat resistance, also be called high speed tool steel.
It has good machinability, but with low strength and impact toughness, easy to oxidize and carbon elimination.

Steel Classification

It is a complex steel type with a carbon content generally is 0.70% – 1.65%. The amount of alloy elements is large, and the total amount is 10% – 25%. Classified according to the alloy elements as below:

  1. Tungsten high speed steel(tungsten content is 9% – 18%)
  2. Tungsten-molybdenum high-speed steel(tungsten content is 5% – 12% and the content of molybdenum is 2% – 6%)
  3. High molybdenum high speed steel(tungsten content is 0% – 2% and the content of molybdenum is 5% – 10%)
  4. Vanadium high-speed steel, according to the different vanadium content, which is divided into general vanadium containing vanadium (1 to 2% vanadium) and high vanadium content (2.5 to 5% vanadium)
  5. Cobalt high speed steel (cobalt content is 5% – 10% )
  6. According to the different applications, they can be divided into general purpose and special purpose

T1 Steel Round Bar Sheet Plate Heat Treatment

Treatment Temperature Range Cooling/Quenching Notes
Forging 1700-2100° F Slow Cool slowly in dry sand or in other insulating media
Annealing 1600-1650° F Cool slowly at a rate of 35° F per hour to 1000° F For best results, insulating media is desirable. Hold at temperature for 2 hours
Stress Relieving 1100-1300° F Cool slowly Stress relieve after rough machining
Preheating 1500-1550° F Preheat time in furnace is ¾ Hr. per inch of thickness. Heating up to temperature as slow as possible
Hardening 2325-2375° F(furnace) 2275-2350° F(salt bath) Quench in air or warm oil. To minimize quenching strains, quench in salt at 1000° F For maximum wear resistance, harden at 2375° F. For maximum toughness and high hardness, harden at 2275° F
Tempering 1022 ° F-1058 ° F Temper T1 tool steel immediately after quenching. Hold for at least 2 hours Double tempering is recommended. The usual tempering time is 2+2 hours. Recommended temperature is 1000-1075° F for cutting tools. 1100-1200° F for shock tools

The Relationship Between Hardness and Tensile Strength

When its hardness is below 500HB, the tensile strength is proportional to the hardness. The T1 hardness decreases as the tempering temperature increases. But, in the quenched state and low temperature tempering below 300 ° C, the relationship between hardness and tensile strength is difficult to maintain. When the tempering temperature is about 300 °C, higher hardness with higher tensile strength. And if the hardness is lower, its tensile strength also is lower.


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