SITHERM 2581 Steel
Designation by Standards
Brand Name | Ravne | Mat. No. | DIN | EN | AISI/SAE |
SITHERM 2581 | UTOP2 | 1.2581 | X30WCrV9-3 | - | H21 |
Chemical Composition (in weight %)
C | Si | Mn | Cr | Mo | Ni | V | W | Others |
0.30 | 0.25 | 0.30 | 2.85 | - | - | 0.40 | 9.00 | - |
Description
This alloy is one of the hot work, tungsten containing tool steels. The tungsten content is beneficial for hot strength at red heat, although toughness is somewhat reduced.
Applications
Used for hot working dies and tooling such as die casting, extrusion and hot forming of parts. Pressure die casting tools, moulds for Cu and Cu-alloys. This grade is not used for water cooled tools.
Physical properties (average values) at ambient temperature
Modulus of elasticity [103 x N/mm2]: 190-210 Density [g/cm3]: 7.80
Thermal conductivity [W/m.K]: 27.0
Electric resistivity [Ohm mm2/m]: 0.52 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 |
11.5 | 12.0 | 12.2 | 12.5 | 12.9 | 13.0 | 13.5 |
Continuous Cooling Transformation (CCT) Diagram
Soft Annealing
Heat to 780-810oC, cool slowly. This will produce a maximum Brinell hardness of 240.
Stress Relieving
Stress relieving to remove machining stresses should be carried out by heating to 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 1080-1160oC followed by air, oil or warm bath quenching. Hardness after quenching is 47-53 HRC.
Tempering
Tempering temperature: See the table bellow.
Tempering Temperature (oC) vs. Hardness (HRC)
400oC | 500oC | 550oC | 600oC | 650oC | 700oC |
49 | 49 | 51 | 50 | 46 | 36 |
Tempering Diagram
Forging
Hot forming temperature: 1150-926oC.
Machinability
The tungsten content makes H21 somewhat difficult to machine. As compared to the W group of water hardening low alloy steels rated at 100% for machinability the H21 would rate 55%.
Corrosion Resistance
This is a steel alloy and does not have corrosion resistance. It will rust unless given protective treatment.
Welding
This alloy may be welded. Consult the supplier for details.
Forms manufactured: Please see the Dimensional Sales Program.
Disclaimer
The information and data presented herein are typical or average values and are not a guarantee of maximum or minimum values. Applications specifically suggested for material described herein are made solely for the purpose of illustration to enable the reader to make his own evaluation and are not intended as warranties, either express or implied, of fitness for these or other purposes. There is no representation that the recipient of this literature will receive updated editions as the become available.
Unless otherwise specified, registered trademarks are property of SIJ Metal Ravne company. Copyright 2016 by SIJ Metal Ravne d.o.o. All rights reserved. Contact our Sales Office for more information.
