Technical conditions for high strength steel plates of S890QL
1. Scope
The technical conditions apply to high strength steel plates of S890QL with thickness not more than 300mm use for Weld-able heavy equipments and parts (8mm-300mm)
2. Adopt standard:
EN10025-6 Hot rolled products of structural steels Part 6: Technical delivery conditions for flat products of high yield strength structural steels in the quenched and tempered condition.
3. Dimension, Shape, Weight and Permissible Deviation
The dimension, shape, weight and permissible deviation shall meet the requirements of EN10029.
4. Technical conditions
4.1 Chemical composition (Ladle analysis)
The chemical composition of plates shall be accordance with the following table 1.
Table 1 Chemical composition (Ladle analysis)
C | Si | Mn | P | S | Mo | Cr | Ni | Cu | Nb | V | B |
Max 0.20 | Max 0.80 | Max 2.00 | Max 0.025 | Max 0.015 | Max 0.70 | Max 1.50 | Max 2.00 | Max 0.50 | Max 0.06 | Max 0.12 | Max 0.0050 |
4.2 Mechanical properties
The mechanical properties of S890QL shall meet the requirement as table 2.
Table 2 Tensile properties
Thickness mm | Yield strength MPa | Tensile strength MPa | -40 C Akv (J) Longitudinal | Elongation % |
8-50 | Min 890 | Min 940 | Min 34J | Min 12 |
51-120 | Min 830 | Min 880 | Min 34J | Min 12 |
121-300 | Min 800 | Min 850 | Min 34J | Min 12 |
4.3 Surface quality
The surface quality of plates shall be accordance with EN10163-2.
4.4 Ultrasonic inspection
Plates shall be ultrasonic inspected per EN10160-1999 S2E2.
4.5 Test method and inspection rules
Test items, sampling quantity, sampling method and test method shall conform to table 4.
Table 4 Test items for plates
No. | Test item | Quantity, Piece | Sampling method | Test method |
1 | Chemical composition (Ladle analysis) | 1 (per batch furnace number) | EN10025-6 | EN10025-6 |
2 | Tensile test | 1 (Rolled pc) | EN10025-1 | EN10025-1 |
3 | Impact test at -40C | 3 (Rolled pc) | EN10025-1 | EN10025-1 |
4 | Hardness test | 1 (Product pc) | EN10025-1 | EN10025-1 |
5 | Ultrasonic test | Each product pc | EN10160 | EN10160 |
5. Package, marking and certificate
Package, marking and certificate shall conform to EN10083-1.
6. The third party inspection
The chemical composition, tensile test and Hardness test for plates of S890QL shall be witnessed by surveyor of client.
7. Delivery conditions
The delivery conditions for plates of S890QL shall be Quenching+ Tempering.
8. Other requirements
The other requirements for plates of S890QL shall be accordance with EN10025-6.
MTC accordance with EN10204 3.1
