1.Supply Form & Size & Tolerance
|Round bar |
|Process||Cold Drawn||Hot Rolled||Hot Forged||Free Forging |
|Flat bar |
|Width||Max 800mm||Max 800mm||Max 800mm|| |
|Process||Cold Drawn||Hot Rolled||Hot Forged|| |
Remark:Tolerance can be customized as per requests
|ASTM A600||T1||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 |
|DIN ISO 4957||1.3355||0.70-0.78||0.4||0.03||0.03||0.45||3.80-4.50||–||1.00-1.20||17.50-18.50 |
|GB/T 9943||W18Cr4V||0.70-0.80||0.10-0.40||0.03||0.03||0.20-0.40||3.80-4.40||0.3||1.00-1.40||17.5-19.00 |
|JIS G4403||SKH2||0.73-0.83||0.4||0.03||0.03||0.45||3.80-4.50||–||1.00-1.20||17.20-18.70 |
|Density ||8.67g/cm3 |
|Thermal expansion （ 20-200 °Cmore ， untreated)||9.7 x 10 -6 /ºC |
|Thermal conductivity (100 °Cmore ， untreated)||19.9 x W/m-K |
4. Mechanical Property
|Hardness, Rockwell C||63.0 - 65.0 |
|Poisson's ratio||0.27-0.30 |
|Elastic modulus||190-210 GPa |
Pre heat the AISI T1 with two steps.First,heat slowly and uniformly to 850-900°C with a rate not exceeding 220°C per hour,second,heat more quickly to the forging temperature of 1050-1150°C.Re-heating is necessary when temperature below 950°C. Slow cooling in furnace after forging.
Annealing must be performed after hot working and before re-hardening.Heat the temperature to 850 to 900°C with a rate not exceeding 220°C per hour.Controlled slow cooling in furnace at 10 to 20°C per hour to approximately 700°C, followed by cooling in still air. Hardness after annealing 270 Brinell, maximum.
It is recommended to stress relieve after machining and prior to hardening to minimise the possibility of distortion.Heat in a neutral atmosphere to the temperature of 600 to 700°C, and soak for approximately two hours,followed by slow cooling in the furnace.
Pre heat in two steps at 450-500°C and 850-900°C,then austenitising at a temperature suitable for chosen working temperature.Hardening in a protective atmosphere,for furnace 1270-1300°C,for salt bath 1250-1280°C.
Tempering should be carried out immediately after quenching. Heat slowly and uniformly to the tempering temperature,soak well not less than 2 hours(one hour per 25mm of total thickness).Double tempering is recommended. Recommended temperature is 530-580°C for cutting tools. 590-650°C for shock tools.
10.Guidelines for Hardening&Tempering
|Single-edge cutting tools||1280°C||550°C – 570°C |
|Multi-edge cutting tools||1180°C – 1280°C||550°C – 570°C |
|Cold work tools||1150°C – 1200°C||550°C – 570°C |
T1 tool steel is usually used in the manufacture of all kinds of cutting tools,such as turning tool,milling cutter,reamer,drill bit,saw blade,twist drill, also highly suitable for cold-forming tools such as cold extrusion rams and dies, as well as plastic moulds with elevated wear resistance and screws.