WYJ014-2004 X70 steel plate
2012年3月9日 by admin
1. The range
1.1 the technical conditions stipulated the west-east gas transmission project used in the manufacture of straight pipe of the submerged arc welding seam hot rolling steel material, manufacturing, testing, test and the related requirements, applicable to the project use API SPEC 5 L X70 steel grade straight seam submerged arc welding steel pipe manufacturing with 12.3 mm and 14.7 mm and 18.4 mm thickness of the steel plate.
1.2 plate size
Steel plate size (trimming) coincidence to table 1. But the purchase contract for the wide when otherwise stipulated, the contract provisions.
Table 1 Steel plate size
| nominal thickness mm | width mm | length mm | Note |
| 12.3 | 2175 | 12000 | 管径φ711mm |
| 14.7 | 2165 | 12000 | |
| 18.4 | 2155 | 12000 |
1.3 the technical conditions of the provisions of the steel manufacturing steel pipe applicable to transport conform to the requirements of the GB17820 type temperament of natural gas.
2. Chemical composition
2.1 chemical composition
According to the technical conditions of the supply of the chemical composition of the steel plate, including melting analysis and product analysis results should be consistent with the requirements of the table 3.
2.2 carbon equivalent
Carbon equivalent (Ceq) and cold crack sensitive coefficient (Pcm) should press type (1), (2) of calculation:
Ceq = C + Mn / 6 + (Mo + Cr + V) / 5 + (Ni + Cu) / 15 (1)
Pcm = C + Si / 30 + Mn / 20 + Cu / 20 + Ni / 60 + Cr / 20 + Mo / 15 + V / 10 + 5 B (2)
2.3 melting analysis
Every time a ausmelt smelting furnace should be melting analysis and provide report, chemical composition in steel must comply with the requirements of the table 2, and provide other intends to add the contents of the elements.
2.4 product analysis
Each time the production of ausmelt smelting furnace steel should be a finished product analysis, and provide report.
2.5 acceptance
If a melt furnaces times of chemical composition of 5.1 is not in conformity with the requirements, the GaiYing melt furnaces of time made all steel plate steel shall be rejected.
3. Mechanical properties
The tensile properties of 3.1
The results of tensile test should be consistent with the requirements of the table 3.
Tags: X70 WYJ014-2004 X70 WYJ014-2004 X70 steel plate
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