- 1.3255, DIN S18-1-2-5, AISI T4 round bar
- 1.3255, DIN S18-1-2-5, AISI T4 forging
- 1.3255, DIN S18-1-2-5, AISI T4 sheet
- 1.3255, DIN S18-1-2-5, AISI T4 flat bar
- 1.3255, DIN S18-1-2-5, AISI T4 pipe
1.3255, DIN S18-1-2-5, AISI T4
Production specification
Square-shape steel: 1mm to 4000mm
Plate steel:0.1mm to 4000mm
Width: 10mm to 2500mm
Lenth: We can supply any lenth based on the customer's requirement.
Forging: Shafts with flanks/pipes/tubes/slugs/donuts/cubes/other shapes
Tubings: OD: φ6-1800mm, with wall thickness ranging from 1-35 mm.
Finished goods condition: hot forging/hot rolling + annealing/normalizing + tempering/quenching + tempering/any conditions based on the customer's requirement
Surface conditions: scaled (hot working finish)/ground/rough machining/fine machining/based on the customer's requirement
Furnaces for metallurgical processing: electrode arc + LF/VD/VOD/ESR/Vacuum consumable electrode.
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1.3255, DIN S18-1-2-5, AISI T4
Designation by Standards
Brand Name | LH No. | Mat. No. | DIN | EN | AISI |
BRC | 873 | 1.3255 | S18-1-2-5 | HS18-1-1-5 | T4 |
Chemical Composition (in weight %)
C | Si | Mn | Cr | Mo | Ni | V | W | Others |
0.79 | max. 0.45 | max. 0.40 | 4.15 | 0.65 | - | 1.55 | 18.00 | Co: 4.75 |
Description
This alloy is a High Speed, tungsten type steel/" target="_blank" class="keylink">tool steel. It is a deep hardening alloy capable of Rockwell C 64 hardness.
Applications
Generally used as cutting tools, broaches and cold extrusion punches, turning, planing and milling cutters for roughing work.
Physical properties (avarage values) at ambient temperature
Modulus of elasticity [103 x N/mm2]: 217
Density [g/cm3]: 8.70
Thermal conductivity [W/m.K]: 19.0
Electric resistivity [Ohm mm2/m]: 0.65
Specific heat capacity[J/g.K]: 0.46
Coefficient of Linear Thermal Expansion 10-6 oC-1
20-100oC | 20-200oC | 20-300oC | 20-400oC | 20-500oC | 20-600oC | 20-700oC |
10.0 | 10.5 | 10.8 | 11.2 | 11.3 | 11.4 | 11.6 |
Soft Annealing
Heat to 820-850oC, cool slowly in furnace to 550oC then air. This will produce a maximum Brinell hardness of 265.
Stress Relieving
Stress relieving to remove machining stresses should be carried out by heating to 600-650oC, holding for one hour at heat, followed by air cooling. This operation is performed to reduce distortion during heat treatment.
Hardening
Harden from a temperature of 1260-1290oC followed by oil, air quenching or warm bath at 550oC. Hardness after quenching is 63-66 HRC.
Tempering
Tempering temperature: 2x 560-580oC. Hardness after tempering is 64-65 HRC.
Tempering Temperature (oC) vs. Hardness (HRC)
100oC | 150oC | 200oC | 250oC | 300oC | 350oC | 400oC | 450oC | 500oC | 550oC | 600oC | 650oC |
65 | 64 | 63 | 62 | 61.5 | 61.5 | 62.5 | 63.5 | 65 | 65.5 | 63 | 55 |
Forging
Hot forming temperature: 1150-900oC.
Cold working
In the annealed condition the alloy may be cold worked by conventional methods.
Machinability
Machinability of T4 is only fair. It ranks as 55% that of the W group water hardening simple steel/" target="_blank" class="keylink">tool steels.
Corrosion Resistance
Although this alloy contains appreciable amount of tungsten it is still not a corrosion resistant alloy. it will rust unless adequately protected.
Welding
The alloy may be welded but has a high tungsten content. Consult the alloy supplier for information relative to welding methods.
Mechanical properties
Heat treatment
Machining
Welding performance
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