A516Gr70+904L Clad steel plate Chemical Composition and Mechanical Property
|
ASTM A516 Grade 70 Chemical Composition |
|||||
|
Grade |
The Element Max (%) |
||||
|
C |
Si |
Mn |
P |
S |
|
|
ASTM A516 grade 70 |
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|
Thick <12.5mm |
0.27 max |
0.15–0.40 |
0.85–1.20 |
0.035 |
0.035 |
|
Thick12.5-50mm |
0.27 max |
0.15–0.40 |
0.85–1.20 |
0.035 |
0.035 |
|
Thick50-100mm |
0.27 max |
0.15–0.40 |
0.85–1.20 |
0.035 |
0.035 |
|
Thick100-200mm |
0.27 max |
0.15–0.40 |
0.85–1.20 |
0.035 |
0.035 |
|
Thick>200mm |
0.27 max |
0.15–0.40 |
0.85–1.20 |
0.035 |
0.035 |
|
Grade |
ASTM A516 Grade 70 Mechanical Property |
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|
Thickness |
Yield |
Tensile |
Elongation |
|
|
ASTM A516 grade 70 |
mm |
Min Mpa |
Mpa |
Min % |
|
6-40 |
260 |
485-620 |
21% |
|
|
40-100 |
260 |
485-620 |
17% |
|
| Grade |
C
|
Mn |
P
|
S
|
Si |
Cr |
Ni | Mo | Ni |
Cooper
|
| 904L(N08804) | 0.020 | 2.00 | 0.045 | 0.035 | 1.00 | 19.0-23.0 | 23.0-28.0 | 4.00-5.00 | 0.10 | 1.00-2.00 |
| Grade |
Yield strength (N/mm2), min |
Tensile strength (N/mm2), min |
Elongation in 2 in. (50mm), %, min |
|
Cold bend | ||||||
|
Austenitic (Chromium-Nickel) (Chromium-Manganese-Nickel) |
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| 904L(N08804) |
|
|
35 |
|
not required | ||||||
Welding Process and Precautions
Welding of the Base Layer (A516Gr70)
Pre-welding preparation: The preheating temperature is 150–250°C, and low-hydrogen welding materials (such as E7015) are selected to reduce the risk of hydrogen-induced cracks.
Welding parameters: For gas shielded welding, the current is 100–200A, the voltage is 20–30V, and the welding speed is 5–10mm/s; for submerged arc welding, H08MnA welding wire + SJ101 flux can be used.
Post-welding treatment: Post-heat treatment (holding at 600–650°C for 2 hours) is performed to eliminate residual stress, and non-destructive testing (RT/UT) is conducted if necessary.
Welding of the Cladding Layer (904L)
Selection of welding materials: ER385 welding wire (with composition matching 904L) or E385-16 welding electrodes are used to avoid carbon contamination (carbon content ≤0.02%).
Process control:
Welding with low heat input (current ≤150A, interpass temperature ≤100°C) to reduce sensitization in the heat-affected zone.
GTAW (gas tungsten arc welding) or GMAW (gas metal arc welding) is adopted, while SAW (submerged arc welding) is avoided to prevent the reduction of corrosion resistance due to excessive fusion ratio.
Post-welding treatment: Generally, no heat treatment is required. If it is necessary to enhance corrosion resistance, solution treatment can be carried out by heating to 1100–1150°C followed by rapid cooling.
A516Gr70+904L Clad steel plate Application
A516Gr70+904L Clad steel plates are used in Construction of Bridges, Highway Construction and Other Engineering construction.
A516Gr70+904L Clad steel plate Other Name
A516Gr70+904L Clad steel plate, A516Gr70 steel plate, 904L steel plate
Additional Condition
UT(Ultrasonic examination), AR(As Hot Rolled only), TMCP(Thermal Mechanical Control Processing), N(Normalized), Q+T(Quenched and Tempered),Z Direction Test(Z15,Z25,Z35), Charpy V-Notch Impact Test, The Third Party Test (such as SGS Test), Coated or Shot Blasting and Painting.
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