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ISO/TR 15608 ISO/TR 15608 Material Group 3.1

ISO/TR 15608 Material Group 3.1: Quenched and tempered (QT) fine-grain high strength low alloy steel with a specific minimum yield strength 360 < ReH ≤ 690 N/mm2.

What is the quenched and tempering (QT) process of high strength low alloy steels?

Quenching and tempering is a heat-treatment method for high strength low alloy steel. Quenching and tempering consists of a two-stage heat-treatment process.
Stage 1 includes hardening, in which the plate is austenitised to approximately 900°C and then quickly cooled. The material is water-quenched in a quench unit, in which the plate is clamped to avoid warpage.
Stage 2 consists of tempering the material to obtain the desired material properties. Quenching and tempering achieves an extremely fine-grained and homogeneous microstructure. Quenched and tempered steel is characterised by high strength and good ductility.

Weldability of high strength steels ISO/TR 15608 Material Group 3.1

The high-strength tempered materials are generally weldable. However, certain requirements must be met during welding with regard to heat input and controlled cooling in the heat-affected zone and the use of hydrogen-reduced weld metal.

Normally, materials up to a wall thickness of 15 – 20 mm can usually be welded without preheating.

When welding high strength steels, it should be noticed that that a tempering effect occurs due to the heat input during welding, which influences the properties of the base material. The temperature-time cycles during welding have a significant effect on the mechanical properties of a welded joint and the heat effect zones. It is understood, that the t8/5-time is sufficient to describe the temperature-time characteristics. t8/5 is the cooling time from 800°C to 500°C and describes the cooling conditions of an individual weld pass for the weld metal and the corresponding heat affected zone (HAZ). t8/5 depends on the heat input during welding, the plate temperature (or interpass temperature), the shape factor (geometry) and on plate thickness if two dimensional heat flow occurs which is generally the case for thin plates. To achieve satisfactory weld metal properties the welding parameters must be limited with increasing yield strength. For example acceptable properties for an P690QL1 steel are normally obtained with cooling times between 5 s and 20 s. For lower cooling times the hardness of the heat affected zone may exceed limiting values with the risk of introducing cracks.

The hydrogen content of the consumables H2 has a significant influence on the preheating temperature. In order to reduce the risk of hydrogen-induced cracking the preheating temperature must be increased with growing hydrogen content.

Flame straightening of high strength low alloy steels ISO/TR 15608 Material Group 3.1

The maximum recommended temperatures for Flame straightening is usually < 550°C for quenched and tempered steels.

Quenched and tempered (QT) fine-grain steels with a specific minimum yield strength ReH > 690 N/mm2see Group 3.2

Name/GradNumberStandardProductRemarks/Trade Mark
G20Mn51.5419EN 10213CastEN 13445-2 & EN 13480-2
20MnMoNi4-51.6311EN 10028-2PlateEN 13445-2 & EN 13480-2
15NiCuMoNb5-6-4
15NiCuMoNb5-6-4
1.6368
1.6368
EN 10028-2
EN 10216-2
Plate
Smls. tube
EN 13445-2 & EN 13480-2
EN 13445-2 & EN 13480-2
L415QE
L415QE
1.8947
1.8947
EN ISO 3183
EN 10253-2
Pipe for natural gas pipeline
Fitting

L450QE
L450QE
1.8952
1.8952
EN ISO 3183
EN 10253-2
Pipe for natural gas pipeline
Fitting

L485QE
L485QE
1.8955
1.8955
EN ISO 3183
EN 10253-2
Pipe for natural gas pipeline
Fitting

L550QE1.8957EN ISO 3183Pipe for natural gas pipeline
P460Q1.8870EN 10028-6PlateEN 13445-2 & EN 13480-2
P460QH1.8871
1.8871
EN 10028-6
EN 10273
Plate
Bar
EN 13445-2 & EN 13480-2
EN 13445-2 & EN 13480-2
P460QL11.8872EN 10028-6PlateEN 13445-2 & EN 13480-2
P460QL21.8864EN 10028-6PlateEN 13445-2 & EN 13480-2
P500Q1.8873EN 10028-6PlateEN 13445-2 & EN 13480-2
P500QH
P500QH
1.8874
1.8874
EN 10028-6
EN 10273
Plate
Bar
EN 13445-2 & EN 13480-2
EN 13445-2 & EN 13480-2
P500QL11.8875EN 10028-6PlateEN 13445-2 & EN 13480-2
P500QL21.8865EN 10028-6PlateEN 13445-2 & EN 13480-2
P620QH1.8877EN 10216-3Smls. tubeEN 13445-2 & EN 13480-2
S690Q1.8931EN 10025-6PlateMAXIL® 690
P690Q1.8879
1.8879
EN 10028-6
EN 10216-3
Plate
Smls. tube
EN 13445-2 & EN 13480-2
EN 13445-2 & EN 13480-2
S690QL1.8928EN 10025-6PlateMAXIL® 690QL
P690QH
P690QH
P690QH
1.8880
1.8880
1.8880
EN 10028-6
EN 10216-3
EN 10273
Plate
Smls. tube
Bar
EN 13445-2 & EN 13480-2
EN 13445-2 & EN 13480-2
EN 13445-2 & EN 13480-2
S690QL11.8988EN 10025-6PlateMAXIL® 690QL1
P690QL1
P690QL1
1.8881
1.8881
EN 10028-6
EN 10216-3
Plate
Smls. tube
EN 13445-2 & EN 13480-2
EN 13445-2 & EN 13480-2
P690QL2
P690QL2
1.8888
1.8888
EN 10028-6
EN 10216-3
Plate
Smls. tube
EN 13445-2 & EN 13480-2
EN 13445-2 & EN 13480-2
P620Q1.8876EN 10216-3Smls. tubeEN 13445-2 & EN 13480-2
P620QL1.8890EN 10216-3Smls. pipeEN 13445-2 & EN 13480-2
P420QH1.8936EN 10224-4ForgingEN 13445-2 & EN 13480-2
F
F
K11576
K11576
ASTM A–517
ASTM A-592
Plate
Forging
ASME BPVC
ASME BPVC
B
B
K11630
K11630
ASTM A–514
ASTM A-517
Plate
Forging
ASME BPVC
ASME BPVC
EK11695ASTM A–592ForgingASME BPVC
A
A
A
K11856
K11856
K11856
ASTM A–514
ASTM A-517
ASTM A–592
Plate
Forging
Forging
ASME BPVC
ASME BPVC
ASME BPVC
3, Cl. 1
3, Cl. 2
K12042
K12042
ASTM A-508
ASTM A-508
Forging
Forging
ASME BPVC
ASME BPVC
A, Cl. 1
A, Cl. 2
A, Cl. 3
J100
K12521
K12521
K12521
K12521
ASTM A-533
ASTM A-533
ASTM A-533
ASTM A-672
Plate
Plate
Plate
Fusion welded pipe
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
D, Cl. 1
D, Cl. 2
D, Cl. 3
K12529
K12529
K12529
ASTM A-533
ASTM A-533
ASTM A-533
Plate
Plate
Plate
ASME BPVC
ASME BPVC
ASME BPVC
B, Cl. 1
B, Cl. 2
B, Cl. 3
K12539
K12539
K12539
ASTM A-533
ASTM A-533
ASTM A-533
Plate
Plate
Plate
ASME BPVC
ASME BPVC
ASME BPVC
C, Cl. 1
C, Cl. 2
C, Cl. 3
C, Cl. 4
K12554
K12554
K12554
K12554
ASTM A-533
ASTM A-533
ASTM A-533
ASTM A-533
Plate
Plate
Plate
Plate
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
2, Cl. 1
2, Cl. 2
K12766
K12766
ASTM A-508
ASTM A-508
Forging
Forging
ASME BPVC
ASME BPVC
E
E
K21604
K21604
ASTM A–514
ASTM A–517
Plate
Plate
ASME BPVC
ASME BPVC
P
P
K21650
K21650
ASTM A–514
ASTM A–517
Plate
Plate
ASME BPVC
ASME BPVC
4N, Cl. 1
4N, Cl. 2
4N, Cl. 3
K22375
K22375
K22375
ASTM A-508
ASTM A-508
ASTM A-508
Forging
Forging
Forging
ASME BPVC
ASME BPVC
ASME BPVC
B, Cl. 1
B, Cl. 2
B, Cl. 3
K42339
K42339
K42339
ASTM A-543
ASTM A-543
ASTM A-543
Plate
Plate
Plate
ASME BPVC
ASME BPVC
ASME BPVC
5, Cl. 1
5, Cl. 2
K42365
K42365
ASTM A-508
ASTM A-508
Forging
Forging
ASME BPVC
ASME BPVC
ASME BPVC
QASTM A–514PlateASME BPVC
C, Cl. 1
C, Cl. 2
C, Cl. 3


ASTM A-543
ASTM A-543
ASTM A-543
Plate
Plate
Plate
ASME BPVC
ASME BPVC
ASME BPVC
J80
J90

ASTM A-672
ASTM A-672
Fusion welded pipe
Fusion welded pipe
ASME BPVC
ASME BPVC
ASME BPVC
4, Cl. A
4, Cl. B
4, Cl. E
J13047
J13047
J13047
ASTM A-487
ASTM A-487
ASTM A-487
Casting
Casting
Casting
ASME BPVC
ASME BPVC
ASME BPVC
X56Q
X56QO
X56QS
X60Q
X60QO
X60QS
X65Q
X65QO
X65QS
X70Q
X70QO
X70QS
X80Q
X80QO













API Spec 5L
API Spec 5L
API Spec 5L
API Spec 5L
API Spec 5L
API Spec 5L
API Spec 5L
API Spec 5L
API Spec 5L
API Spec 5L
API Spec 5L
API Spec 5L
API Spec 5L
API Spec 5L
Smls. & welded pipe
Smls. & welded pipe
Smls. & welded pipe
Smls. & welded pipe
Smls. & welded pipe
Smls. & welded pipe
Smls. & welded pipe
Smls. & welded pipe
Smls. & welded pipe
Smls. & welded pipe
Smls. & welded pipe
Smls. & welded pipe
Smls. & welded pipe
Smls. & welded pipe
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
Table: Typical materials