Firstly.
1. Scope of application This technical condition is applicable to 517GrQ Modified hot rolled steel plate with thickness > 65~100mm, (Modified means improved) for offshore platform manufacturing.
2. Chemical composition The chemical composition of steel shall comply with the provisions of the following table. (%)
CSiMnPSNiCrMoVB acuities were 0.18, 0.50, 1.60, 0.020, 0.010 or less or less or less or less acuities were 1.80, 1.50, 1.60, 0.10, 0.0 or less or less or less or less
3. Mechanical properties
specification
mm Mechanical properties Impact test T/4 (vertical) Impact test T/2 (vertical) Lateral expansion mm hardness test T/4HB Yield strength Mpa Tensile strength Mpa Section shrinkage %A50% temperature
° C Impact power J Temperature
℃ Impact work J177.8≥690790-930≥45≥14-37≥69-27≥69≥0.38≥260
4. Manufacturing process and delivery status
4-1, smelting method: liquid steel must be vacuum treatment.
4-2, the delivery status of the steel plate: hot rolling delivery, sample tempering treatment, and according to the sample tempering performance of the material report.
7. Surface quality The surface quality of the steel plate should meet the requirements of ASTM A20/A20M.
8. Ultrasonic inspection steel plate for ultrasonic inspection, inspection standards and qualification level indicated in the contract.
Second, A517GrQ steel plate use:
A517GrQ is mainly used for offshore platform construction, mining and all kinds of engineering construction of drilling RIGS, shovels, electric wheel dump trucks, mining vehicles, excavators, loaders, bulldozers, all kinds of cranes, coal mine hydraulic support and other mechanical equipment and other structural parts. Implement standard WYJ, delivery status: normalizing, normalizing + tempering, tempering, etc.
Main trace chemical elements and mechanical properties: A517GrQ yield is not less than 510, main trace elements, Ni is not less than 1.5, Cr is not less than 1, Mo is not less than 0.5.
A517GrQ offshore oil platform steel: Domestic Wugang can produce A517GrQ offshore oil drilling rack steel, began to put into production in 2009, and through a number of authoritative classification society certification. In order to expand the production capacity of products and meet the market demand for large-thickness offshore platform rack steel, Wugang has opened up a new heat treatment process route for 177.8mm thick offshore platform rack steel A517GrQ, and strives to improve the production capacity of this product. With the development of countries to the deep-sea drilling field, the rack steel with a thickness of 177.8mm has become an internationally recognized main specification for the manufacture of the rack, one of the most important components of deep-sea jack-up offshore platforms.
1, available for steel plate specifications range: thickness 8-650mm, width 1500-4020mm, length 4000mm-17000mm, single weight maximum 30.00 tons. Larger steel plates are also available as required.
2, available types of steel plate: carbon structural steel plate, low alloy high strength steel plate, bridge steel plate, building structure steel plate, shipbuilding and offshore platform steel plate, boiler and pressure vessel steel plate,
Mold steel plate, alloy structure steel plate, oil and gas pipeline steel plate, high strength and high toughness steel plate, corrosion resistant steel plate, composite steel plate, wear-resistant steel plate more than 300 domestic and foreign brands.
3, can be used for inspection requirements, Z15-Z35 thickness direction performance requirements, high strength and high toughness requirements of steel plate.
4, according to the national standard, metallurgical standard, American standard AISI/ASME/ASTM, Japanese JIS, German standard DIN, French NF, British BS, European EN, international ISO and other standards supply.
5, available for heat treatment process: control rolling, normalizing, tempering, normalizing and tempering, etc.
