T4
Qilu
Product Description
SKH3 1.3255 T4 High Speed Steel Round Bar
1: AISI T4 Steel Introduction
AISI T4 tool steel is one of tungsten type high speed tool steel, which belongs to ASTM A600specification, the standard for high speed tool steel materials. T4 tool steel is similar to T1 Tool Steel materials, but with 4.25~5.75% cobalt added to increase heat resistance. The red hardness of T4 steel and the high temperature hardness is a little higher than T1 tool steel. AISI T4 tool steel is a deep hardening alloy capable of Rockwell C 64 hardness.
T4 steel Stock in warehouse
2: A600 Quality Standard
ASTM-A600-1992-ENG Standard-Specification-for-High-Speed-Tool-Steel.pdf
3: AISI T4 Steel Equivalent
| Country | USA | German | Japan |
| Standard | ASTM A600 | DIN EN ISO 4957 | JIS G4403 |
| Grade | T4/T12004 | 1.3255/HS18-1-2-5 | SKH3 |
4: AISI T4 Steel Chemical Composition
| Grade | C | Si | Mn | P | S | Cr | Mo | V | W | Co |
| T4 | 0.7-0.8 | 0.2-0.4 | 0.1-0.4 | 0.03 | 0.03 | 3.75-4.5 | 0.4-1.0 | 0.8-1.2 | 17.5-19 | 4.25-5.75 |
| 1.3255 | 0.75-0.83 | 0.45 | 0.4 | 0.03 | 0.03 | 3.8-4.5 | 0.5-0.8 | 0.8-1.2 | 17.5-18.5 | 4.5-5.5 |
| SKH3 | 0.73-0.83 | 0.45 | 0.4 | 0.03 | 0.03 | 3.8-4.5 | / | 0.8-1.2 | 17-19 | 4.5-5.5 |
5: AISI T4 Steel Mechanical Properties
The mechanical properties mainly include tensile strength, yield strength, elongation, area or reduction, hardness, impact value, non-metalic inclusion etc. Different heat treatment, the mechanical properties will be different, such as normalized, tempered, QT. If you want to know the properties, kindly contact the salesman.
6: AISI T4 Steel Overviews
| Size | Round | Dia 2-300mm |
| Plate/Flat/Block | Thickness 2mm-20mm | |
| Width 10mm-100mm | ||
| Heat treatment | Normalized ; Annealed ; Quenched ; Tempered | |
| Surface condition | Black; Peeled; Polished; Machined; Grinded; Turned; Milled | |
| Delivery condition | Forged; Hot rolled; Cold drawn | |
| Test | Tensile strength, Yield strength, elongation, area of reduction, impact value, hardness, grain size, ultrasonic test, US inspection, magnetic particle testing, etc. | |
| Payment terms | T/T;L/C;/Money gram/ Paypal | |
| Trade terms | FOB; CIF; C&F; etc.. | |
| Delivery time | 30-45 days | |
7: AISI T4 Steel Application
T4 are used for Drills, Milling Cutters, Thread Cutting Tools, Knurling Tools, Cold extrusion punches, Broaches etc.
8: AISI T4 Steel Heat Treatment
Hardening
Harden T4 high speed tool steel from a temperature of 1260-1290oC followed by oil, air quenching or warm bath at 550oC. Hardness after quenching is 63-66 HRC.
Annealing
T4 steel should be annealed after hot working. Increase the temperature of T4 high speed steel to 860°C(Max220°C per hour). Hold at the temperature and then cool slowly with the furnace. The annealed hardness achieved should be below HB255.
Tempering
Tempering temperature: 2x 560-580oC. Hardness after tempering is 64-65 HRC.
9: T4 Steel Tolerance
Diameter(mm) | Tolerance | ||
Forged Steel Round Bar | 80-600 | Black Surface:0~+5 | Rough Machined or Turned:0~+3 |
650-1200 | Black Surface:0~+15 | Rough Machined or Turned:0~+3 | |
Hot Rolled Steel Round Bar | 16-310 | Black Surface:0~+1 | Peeled:H11 |
Cold Drawn Steel Round Bar | 6-100 | Black Surface:H11 | Peeled:H11 |
10: Delivery Condition
For hot forged bar, usually the delivery condition is hot forged, annealed rough turned/Black surface.
For hot rolled bar, usually the delivery condition is hot rolled, annealed, Black surface.
For hot forged plate, usually the delivery condition is hot forged, annealed, milled surface
For hot rolled plate, usually the delivery condition is hot rolled, annealed, black surface.
