ASSAB Stavax ESR Datasheet

Wrought Stainless Steel

Supplied by ASSAB Pacific Pte. Ltd.

Create your free Prospector account to view this complete product datasheet. A free account includes access to hundreds of thousands of detailed technical datasheets. Create Your Free Account
Product Description
Stavax ESR is a premium grade stainless tool steel with the following properties:
  • good corrosion resistance
  • excellent polishability
  • good wear resistance
  • good machinability
  • good dimensional stability during heat treatment

The combination of these properties gives a steel with outstanding production performance. The practical benefits of good corrosion resistance in a plastics mould can be summarized as follows:
  • Lower mould maintenance costs: The surface of cavity impressions retain their original finish over extended running periods. Moulds stored or operated in humid conditions require no special protection.
  • Lower production costs: Since water cooling channels are unaffected by corrosion (unlike conventional mould steel), heat transfer characteristics, and therefore cooling efficiency, are constant throughout the mould life, ensuring consistent cycle times.
These benefits, coupled with the high wear resistance of Stavax ESR, offer the moulder low-maintenance, long-life moulds for the greatest overall moulding economy.

Note: Stavax ESR is produced using the Electro-Slag-Refining (ESR) technique, resulting in a very low inclusion content.

Whilst Stavax ESR is recommended for all types of moulding tools, its special properties make it particularly suitable for moulds with the following demands:
  • Corrosion/staining resistance: i.e. for moulding of corrosive materials, e.g. PVC, acetates, and for moulds subjected to humid working/storage conditions.
  • Wear resistance: i.e. for moulding abrasive/filled materials, including injection-moulded thermosetting grades. Uddeholm Stavax ESR is recommended for moulds with long production runs, e.g. disposable cutlery and containers.
  • High surface finish: i.e. for the production of optical parts, such as camera and sunglasses lenses, and for medical containers, e.g. syringes, analysis phials.
Material Status 
  • Commercial: Active
  • Asia Pacific
Available Documents
Technical Datasheet (English)
Metals General
Nominal Value
Applicable Specifications
Metal Type (Annealed)
Alloy Identification
Metals Type Analysis
Nominal Value
Type Analysis
Metals Physical
Nominal Value
Density (68°F)
Metals Mechanical
Nominal Value
Tensile Strength (Ultimate) 2
Tensile Strength (Yield), 0.2% 2
Hardness (HB-Scale)
Tensile Modulus (68°F)
Metals Thermal
Nominal Value
Mean Specific Heat (68°F)
Mean CTE (68 to 392°F)
Thermal Conductivity 3 (68°F)
1Typical properties: these are not to be construed as specifications.
2Hardness: 50 HRC
3Thermal conductivity is very difficult to measure. The scatter can be as high as ±15%.
UL and the UL logo are trademarks of UL LLC © 2022. All Rights Reserved.
The information presented here was acquired by UL from the producer of the product or material or original information provider. However, UL assumes no responsibility or liability for the accuracy of the information contained on this website and strongly encourages that upon final product or material selection information is validated with the manufacturer. This website provides links to other websites owned by third parties. The content of such third party sites is not within our control, and we cannot and will not take responsibility for the information or content.