Technical conditions for plates of 13MnNiMo5-4
1. Scope
The technical conditions apply to plates of 13MnNiMo5-4 with thickness range 25mm-200mm for weldable boiler and other pressure vessel tank.
2. Adopt standard:
EN10028-2:2003 Non-alloy and alloy steels with specified elevated temperature properties
EN10029:1991 Tolerances on dimensions, shape and mass for hot rolled steel plates 3 mm thick or above
EN10163-2:1991 Delivery requirements for surface condition of hot-rolled steel plates, wide flats and sections -Part 2: Plate and wide flats
EN10160-2:1999 Ultrasonic testing of steel flat product of thickness equal or greater than 6 mm reflection method
3. Dimension, Shape, Weight and Permissible Deviation
The dimension, shape, weight and permissible deviation shall meet the requirements of EN10029:1991
The thickness toleration: EN10029-1991 table 1 Class B.
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)
Thickness mm | C | Si | Mn | P | S | Ni | Mo | Nb | Cr | Cu | V |
Ladle analysis | 0.08- 0.15 | 0.10- 0.50 | 1.00- 1.60 | Max 0.020 | Max 0.010 | 0.60- 1.00 | 0.20- 0.40 | 0.005- 0.020 | 0.20- 0.40 | Max 0.20 | 0.02- 0.05 |
Product analysis | 0.06- 0.17 | 0.05- 0.56 | 0.95- 1.70 | Max 0.020 | Max 0.010 | 0.55- 1.05 | 0.15- 0.44 | 0.004- 0.025 | 0.15- 0.45 | Max 0.20 | 0.02- 0.05 |
4.2 Steel making process: EAF+LF/VD
4.3 Mechanical properties
The SWHT mechanical properties of 13MnNiMo5-4 shall meet the requirement as table 2&3&4.
Table 2 Tensile properties
Thickness mm | Yield strength MPa | Tensile strength MPa | Elongation % | Bend test D=3a |
=<100 | Min 390 | 570-740 | Min 18 | 180C un-cracked |
>100-125 | Min 380 | 180C un-cracked | ||
>125-150 | Min 375 | 180C un-cracked |
4.4 Impact properties
Impact test in the longitudinal and transverse for plates of 13MnNiMo5-4 shall meet the requirements per table 3.
Table 3 Impact properties
Charpy-V Impact Test temp. Celsius degree | Transverse Average impact energy | |
20C | 0C | |
Min 39J | Min 34J | |
4.5 Minimum values for the proof strength Rp0.2 at elevated temperatures shall meet the requirements per table 4.
Table 4 Tensile properties
Test TEMP | Thickness mm | 200C | 250C | 300C | 350C | 375C | 400C |
Rp0.2 | =<100 | >=375 | >=360 | >=355 | >=345 | >=335 | >=310 |
>100-125 | >=365 | >=350 | >=345 | >=335 | >=325 | >=300 | |
>125-150 | >=350 | >=340 | >=335 | >=325 | >=315 | >=295 | |
Rm | =<150 | >=535 | >=520 | >=515 | >=515 | >=510 | >=490 |
4.6 SWHT: Simulated Post-Weld Heat Treatment of Mechanical Test Coupons shall be prepared in 610+/-5 C with min.5 minute per each mm of thickness.
4.7 Surface quality
The surface quality of plates shall be accordance with EN10163-2 B3..
4.8 Ultrasonic inspection
Plates shall be ultrasonic inspected per EN10160 S2E2..
4.9 Test method and inspection rules
Test items, sampling quantity, sampling method and test method shall conform to table 5.
Table 5 Test items for plates
Test item | Quantity, Piece | Sampling method | Test method | Sampling conditions |
Ladle analysis | 1 (per furnace) | EN10028 | EN10028 | / |
Product analysis | 1 (Per product pc) | EN10028 | EN10028 | SWHT |
Tensile test | 1 (per heat treatment pc) | EN10028 | EN10028 | |
Charpy-V impact test at 0C | 3 (per heat treatment pc) | EN10028 | EN10028 | |
S7 High TEMP tensile test | 6 (per heat treatment pc) | EN10028 | EN10028 | |
Ultrasonic test | Each product pc | EN10160 | +N | |
5. Package, marking and certificate
Package, marking and certificate shall conform to EN10028.
6. The third party inspection
The chemical composition, tensile test and Charpy V impact test for plates of 13MnNiMo5-4 shall be witnessed by surveyor of client.
7. Delivery conditions
The delivery conditions for plates of 13MnNiMo5-4 shall be Normalized+ Tempered, The Normalized temperature is 890-950 C degree, and Tempered temperature no less than 620 C degree.
8. Other requirements
The other requirements for plates of 13MnNiMo5-4 shall be accordance with EN10028-2.
MTC accordance with EN10204: 2004 3.1
