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ISO/TR 15608 ISO/TR 15608 Material Group 2.1

ISO/TR 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 characterized 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 thermomechanically treated fine-grain steels

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/mm2see Group 2.2

Name/GradeNumberStandardProductRemarks
S420M1.8825EN 10025-4Platestructural steels
S420ML1.8836EN 10025-4Platestructural steels
S460M1.8827EN 10025-4Platestructural steels
S460ML1.8838EN 10025-4Platestructural steels
P420M1.8824EN 10028-5PlateEN 13445-2 & EN 13480-2
P420ML11.8835EN 10028-5PlateEN 13445-2 & EN 13480-2
P420ML21.8828EN 10028-5PlateEN 13445-2 & EN 13480-2
P460M1.8826EN 10028-5PlateEN 13445-2 & EN 13480-2
P460ML11.8837EN 10028-5PlateEN 13445-2 & EN 13480-2
P460ML21.8831EN 10028-5PlateEN 13445-2 & EN 13480-2
L415ME1.8973EN ISO 3183Pipe for pipelines
L450ME1.8975EN ISO 3183Pipe 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
Table: Typical materials

FAQs to ISO/TR 15608 Material Group 2.1

What means material group 2.1 acc. to ISO/TR 15608?

Thermomechanically treated fine-grain steels and cast steels with a specific minimum yield strength 360 < 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.