BRW
  
Identification

 

Designation by Standards
Brand Name Ravne No. Mat. No. DIN EN AISI
BRW 870 1.3355 S18-0-1 HS18-0-1 T1

 

Chemical Composition

 

Chemical Composition in Weight %
C Si Mn Cr Mo Ni V W Others
0.78 max. 0.45 max. 0.45 4.15 - - 1.10 17.95 -

 

General Information

Description
T1 is tungsten type tool steel. Very high resistance to wear and to softening. Good toughness and cutting capability. Deep hardening response.

Applications
Turning, planing and slotting tools, tapes, twist drills, threading dies, profile cutting tools, broaching tools, reamers.

 

Properties

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]: 0.50
Specific heat capacity[J/g.K]: 0.46

Coefficient of Linear Thermal Expansion 10-6 oC-1
20-100 'C 20-200 'C 20-300 'C 20-400 'C 20-500 'C 20-600 'C 20-700 'C 20-800 'C
9.8 11.1 11.4 11.7 11.8 12.0 12.3 12.3

 

Heat Treatment

Soft Annealing
Heat to 820-880 'C, cool slowly in furnace. This will produce a maximum Brinell hardness of 230-300.

Stress Relieving
Stress relieving to remove machining stresses should be carried out by heating to 650 'C, holding for one hour at heat, followed by air cooling. This operation is performed to reduce distortion during heat treatment.

Hardening
Heat up to 450-600 'C, then preheat to 850 'C, and to 1050 'C. Harden from a temperature of 1250-1290 'C followed by oil, air quenching or warm bath 550 'C. Hardness after quenching is 64-66 HRC.

Transformation temperatures: Ac1=824 'C , Ac3=858 'C.

Tempering
Tempering temperature: 3 x 1 hour at 550-570 'C

Tempering Temperature ( 'C) vs. Hardness (HRC)
200 'C 300 'C 400 'C 500 'C 525 'C 550 'C 575 'C 600 'C 650 'C 700 'C
64 62 62 64 65 65.5 64.5 63 56 47

Effect of Tempering Temperature on Hardness

 

Workability


Forging
Hot forming temperature: 1050-900 'C.

Machinability
No data.