Year1
- 材质：
- Q235B
- 规格：
- 219mm以上
- 质量等级：
- 正品（受质量异议）
Usage
Generally used in welding into pipelines for fluid transportation, metal structures, pile foundations, etc.
The products are widely used in water supply projects, petrochemical industry, chemical industry, electric power industry, agricultural irrigation, and urban construction. They are one of the twenty key products developed in our country. Used for water supply and drainage for liquid transportation. For gas transportation, coal gas, steam, and liquefied petroleum gas are used. It is used as piling pipes for structures, pipes for bridges, wharves, roads, building structures, etc.
Features
It can use narrower billets to produce welded pipes with larger diameters, and can also use billets of the same width to produce welded pipes with different diameters. The production cost is low, the process is simple
and it is easy to produce large-diameter pipes. Large-diameter welded pipes mostly use spiral seam submerged arc welding process.
Raw materials
,
Reverse bending performance
According to the requirements of the purchaser, steel bars can be tested for reverse bending performance.
The bending center diameter of the reverse bending test is correspondingly increased by one steel bar diameter compared with the bending test. First forward curvature, then reverse curvature, then reverse curvature. After the reverse bending test, no cracks shall occur on the surface of the bending part of the steel bar.
Surface quality
The surface of steel bars is allowed to be free of cracks, scars and folds.
Bumps are allowed on the surface of the steel bars, but they shall not exceed the height of the transverse ribs. The depth and height of other defects on the surface of the steel bars shall not be greater than the allowable deviation of the size of the location.
Size, shape, weight and allowable deviation
) Nominal diameter range and recommended diameter
The nominal diameter range of steel bars is ~, and the standard recommended nominal diameter of steel bars is,,,.
) Permissible deviations in surface shape and size of ribbed steel plates
The transverse ribs of ribbed steel bars should comply with the following basic regulations
The angle between the transverse ribs and the axis of the steel plate should not be less than 10 degrees. When the angle is not greater than degrees, the direction of the transverse ribs on the opposite sides of the steel bar should be opposite
The distance between the transverse ribs and the steel bar should not be greater than . br/> The sum of the gaps between the ends of the transverse ribs (including the width of the longitudinal ribs) on the opposite sides of the steel bar should not be greater than % of the nominal circumference of the steel bar
When the nominal diameter of the steel bar is not greater than the nominal diameter of the steel bar, the relative rib area should not be less than . When the nominal diameter is and, the relative rib area should not be less than. When the nominal diameter is greater than, the relative rib area should not be less than.
) Length and allowable deviation
Length steel bars are usually delivered in fixed lengths. The specific delivery length should be specified in the contract. When the steel bars are delivered in coils, each coil should be one steel bar, allowing % of the number of plates in each batch (two plates if less than two plates) are composed of two steel bars. The disc weight and disc diameter are determined by negotiation between the supply and demand parties.
, Length Allowable Deviation When steel bars are delivered according to fixed length, the length allowable deviation shall not be greater than +.
The curvature and the bending strain of the straight steel bars at the ends do not affect normal use. The total curvature is not greater than % of the total length of the steel bars. The ends of the steel bars should be sheared straight, and local deformation should not affect the use
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