ISO 15608 Material Group 2.1 : Thermomechanically treated fine-grain steels and cast steels with a specific minimum yield strength 360 < ReH ≤ 460 N/mm2.
Thermomechanically steels (TM) rolled fine-grain structural steels is characterised by a high minimum yield strength ReH by good weldability.
What is the thermomechnical (TM) process?
Exceptionally low alloying-element contents, expressed in low carbon equivalents, assure excellent weldability and high resistance to brittle cracking.
Thermomechanical rolling serves the purpose systematically adjusting its mechanical properties. This is a controlled process, extending from slab reheating, via rolling, up to and including (accelerated) cooling and, where necessary, tempering. The essential effects of thermomechanical rolling are based on micro-alloying with, for example, Nb. The main aim of all mechanisms used in thermomechanical rolling is the attainment of the finest possible grain, this being the necessary basis for the combination of high mechanical strength and toughness with only low alloying-element contents.
Application of thermomechanical treated fine-grain steels ISO 15608 Material Group 2.1
Thermomechanically treated fine-grain steels(TMsteels) are used above all for highly stressed welded structures in the construction of pressure equipments (P…) and steel structures (S…).
The cryogenic grades P…ML are available for special applications at temperatures below -20 °C.
For thermomechanically treated fine-grain steels with specified ReH > 460 N/mm2: see Group 2.2
Typical thermomechanically treated fine-grain steels ISO 15608 Material Group 2.1
| Name/Grade | Number | Standard | Product | Remarks |
|---|---|---|---|---|
| S420M | 1.8825 | EN 10025-4 | Plate | structural steels |
| S420ML | 1.8836 | EN 10025-4 | Plate | structural steels |
| S460M | 1.8827 | EN 10025-4 | Plate | structural steels |
| S460ML | 1.8838 | EN 10025-4 | Plate | structural steels |
| P420M | 1.8824 | EN 10028-5 | Plate | EN 13445-2 & EN 13480-2 |
| P420ML1 | 1.8835 | EN 10028-5 | Plate | EN 13445-2 & EN 13480-2 |
| P420ML2 | 1.8828 | EN 10028-5 | Plate | EN 13445-2 & EN 13480-2 |
| P460M | 1.8826 | EN 10028-5 | Plate | EN 13445-2 & EN 13480-2 |
| P460ML1 | 1.8837 | EN 10028-5 | Plate | EN 13445-2 & EN 13480-2 |
| P460ML2 | 1.8831 | EN 10028-5 | Plate | EN 13445-2 & EN 13480-2 |
| L415ME | 1.8973 | EN ISO 3183 | Pipe for pipelines | – |
| L450ME | 1.8975 | EN ISO 3183 | Pipe for pipelines | – |
| 50 60 | – – | ASTM A-1066 ASTM A-1066 | Plate Plate | ASME BPVC ASME BPVC |
| X56M X56MO A56MS X60M X60MO A60MS | – – – – – – | API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L API Spec 5L | Pipe for pipelines Pipe for pipelines Pipe for pipelines Pipe for pipelines Pipe for pipelines Pipe for pipelines | ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC ASME BPVC |
FAQs to ISO 15608 Material Group 2.1
Thermomechanically treated fine-grain steels and cast steels with a specific minimum yield strength 360 < ReH ≤ 460 N/mm2.
The material groups according to ISO 15608 are primarily classified for welding purposes, but can also be used for other purposes such as heat treatment, forming and non-destructive testing.
Classification is usually based on chemical product analysis and/or mechanical material properties.
This standard covers steels, aluminium and aluminium alloys, copper and copper alloys, nickel and nickel alloys, titanium and titanium alloys, zirconium and zirconium alloys and cast irons.
No, it is similar but not exactly the same.
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