Technical conditions for alloy steel plates of 25CrMo4
1. Scope
The technical conditions apply to plates of 25CrMo4 with thickness not more than 100mm. (10mm-100mm)
2. Adopt standard:
EN10083-3 Steel for quenching and tempering part 3: Technical delivery conditions for alloy steels
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 |
0.22- 0.29 | Max 0.40 | 0.60- 0.95 | Max 0.035 | Max 0.025 | 0.15- 0.25 | 0.90- 1.20 |
4.2 Mechanical properties
The mechanical properties of 25CrMo4 shall meet the requirement as table 2.
Table 2 Tensile properties
Thickness mm | Yield strength MPa | Tensile strength MPa | +20 C Akv (J) Transverse | Elongation % | Hardness Test HBW |
21-60 | Min 600 | 800-950 | Min 35J | Min 12 | Max 240 |
61-100 | Min 550 | 800-950 | Min 35J | Min 12 | Max 240 |
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) | EN10083-3 | EN10083-3 |
2 | Tensile test | 1 (Rolled pc) | EN10083-1 | EN10083-1 |
3 | Impact test at +20C | 3 (Rolled pc) | EN10083-1 | EN10083-1 |
4 | Hardness test | 1 (Product pc) | EN10083-1 | EN10083-1 |
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 25CrMo4 shall be witnessed by surveyor of client.
7. Delivery conditions
The delivery conditions for plates of 25CrMo4 shall be Quenching+ Tempering.
8. Other requirements
The other requirements for plates of 25CrMo4 shall be accordance with EN10083-3.
MTC accordance with EN10204 3.1
