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ISO/TR 15608 ISO/TR 15608 Material Group 2.2

ISO/TR 15608 Material Group 2.2: Thermomechanically treated fine-grain steels (TMsteel) and cast steels with a specific minimum yield strength ReH > 460 N/mm2.

Thermomechanically steels (TM) rolled fine-grain structural steels are characterised at a high yield strength by good weldability.

Thermomechanically steels (TM) rolled fine-grain structural steels is characterised by a high minimum yield strength ReH by good weldability.

What is the thermomechnical process for fine grain steel?

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 thermomechanically treated fine-grain steel

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 360 < ReH ≤ 460 N/mm2see Group 2.1

NameNumberStandardProductRemarks/ Trade Mark
L485ME1.8977EN ISO 3183Pipe for Gas pipeline
L555ME1.8978EN ISO 3183Pipe for Gas pipeline
T3, 70
T3, 80
T7, 70
T8, 80



ASTM A-656
ASTM A-656
ASTM A-656
ASTM A-656
Plate
Plate
Plate
Plate
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
X70M
X70MO
X70MS
X80M
X80MO




API Spec 5L
API Spec 5L
API Spec 5L
API Spec 5L
API Spec 5L
Pipe for pipeline
Pipe for pipeline
Pipe for pipeline
Pipe for pipeline
Pipe for pipeline
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
S500MEN 10025-4Platestructural steels
S500MLEN 10025-4Platestructural steels
S550MEN 10025-4Platestructural steels
S550MLEN 10025-4Platestructural steels
S690MEN 10025-4Platestructural steels
S690MLEN 10025-4Platestructural steels
Table: Typical materials

FAQs to ISO/TR 15608 Material Group 2.2

What means material group 2.2 acc. to ISO/TR 15608?

Thermomechanically treated fine-grain steels (TMSteel) and cast steels with a specific minimum yield strength ReH > 460 N/mm2.

What are material groups in acc. to ISO/TR 15608?

The material groups according to ISO/TR 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.

Which materials are included in the grouping system of ISO/TR 15608?

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.

Is the ISO/TR 15608 grouping system and the P-Numbering system in acc. to ASME Code Section IX identical?

No, it is similar but not exactly the same.