Carbon C: 0.28 ~ 0.34
Silicon Si: 0.90 ~ 1.20
Manganese Mn: 0.80-1.10
Sulfur S: ≤0.025
Phosphorus P: ≤0.025
Chromium Cr: 0.80-1.10
Nickel Ni: ≤0.030
Copper Cu: ≤0.025
3. Corresponding to the foreign grades are SA553, SA353, 9Ni. Domestic Maoyang Steel Factory production.
4. Implementation of standards: GB low-temperature pressure vessels with 9% Ni steel plate flaw detection implementation JB / T non-destructive testing of pressurized equipment
5. Delivery status: the steel plate to offline quenching + tempering of the tempered heat treatment state delivery. In order to improve the toughness of the steel, can also be intermediate heat treatment (secondary quenching), the thickness of not more than 12mm plate can also be two normalized and tempered state delivery, the tempering temperature of the steel plate is not less than 540 ℃.
6. Smelting method: steel using electric furnace + furnace refining method, the steel should be treated with vacuum.
7. Steel plate inspection method?
(1). Tensile test and bending test specimen number and sampling direction ?
From the same slab or the same ingot directly rolled out of each hot rolled steel plate, perpendicular to the rolling direction to take the tensile specimen and bending specimen each 1. For heat-treated steel plates, take one specimen from each batch of heat-treated steel plates under the same conditions. ?
(2). The number of specimens and sampling direction of the impact test ?
One specimen is taken from each plate directly rolled from the same slab or the same ingot, and three specimens are taken from each specimen parallel to the direction of rolling, unless otherwise specified. For heat-treated steel plates, one sample blank from each lot of heat-treated steel plates under the same conditions. ?
(3). Tensile test specimen and bending test specimen sampling location dance steel ?
The specimen should be made, the center of the specimen should be 1/4 width from one edge, and in the case of No. 4 tensile specimen, it should also be 1/4 thickness from the surface. However, when the center of the specimen cannot be fixed at 1/4 width from one side edge or 1/4 thickness from the surface, the specimen shall be taken as close as possible to the specified position. ?
(4). Impact test specimen sampling location ?
The specimen should be made with the center of the specimen at 1/4 width from one side and 1/4 thickness from the surface. However, when it is not possible to take the sample at this location, the sample should be taken as close as possible to the specified location.
8. Ultrasonic inspection: Detection standards and qualification levels are specified in the small contract.
9. High-temperature stretching: high-temperature stretching temperature and performance indicators in the small contract.
According to the needs of the contract (small contract specified in the case) can be a large simulation of post-weld heat treatment system under the detection of non-metallic inclusions and grain size test (not coarser than 5)
According to the needs of the contract (small contract specified in the case) can be a * large simulation of post-weld heat treatment system under the full-thickness hardness test, HB ≤ 220.
10.Use: Mainly Used in petroleum, chemical, power station, boiler and other industries, for the production of reactors, heat exchangers, separators, ball tanks, oil and gas tanks, liquefied gas tanks, nuclear power reactor pressure shell, boiler ladle, liquefied petroleum gas cylinders, high-pressure water pipes in hydropower stations, hydraulic turbine worm shells and other equipment and components.