Huaihua seamless pipe spot price trend, seamless pipe manufacturers

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Various models and specifications are complete, and can also be customized according to customer requirements
rb Seamless steel pipe
rb ① The chemical composition of steel: The chemical composition of steel is an important factor affecting seamless steel pipes One of the most important factors in performance is also the main basis for formulating process parameters for pipe rolling and heat treatment of steel pipes.

rb Alloying elements: intentionally added, according to purpose
rb b. Residual elements: brought in from steelmaking, properly controlled
rb Harmful elements: strictly controlled (
,
b
B
b
), gas (

)
rb Out-of-furnace refining or electroslag remelting: improving the chemistry of steel The uniformity of ingredients and the purity of steel reduce non-metallic inclusions in the tube blank and improve their distribution morphology.
rb ② Geometric dimensional accuracy and appearance of steel pipes
rb Steel pipe outer diameter accuracy: depends on the method of determining (reducing) diameter, equipment operation conditions, process system, etc.
rb Allowable deviation of outer diameter
d= (
)
/D
Maximum or minimum outer diameter
rb: Nominal outer diameter
rb b. Steel pipe wall thickness accuracy: It is related to the heating quality of the tube blank, the process design parameters and adjustment parameters of each deformation process, the tool quality and its lubrication quality, etc.
rb Wall thickness allowable deviation
r= (< br/> )
/
: Maximum or minimum wall thickness in cross section
rb: Nominal wall thickness
rb Steel pipe ovality: Indicates the degree of out-of-roundness of the steel pipe.
rb Steel pipe length: normal length, fixed (multiple) length, length tolerance
rb Steel pipe curvature: Indicates the curvature of the steel pipe: curvature per meter of steel pipe length, curvature of the entire length of the steel pipe
br/> rb Steel pipe end face slope: Indicates the degree of inclination between the steel pipe end face and the steel pipe cross section
rb Steel pipe end face bevel angle and blunt edge
rb Steel pipe surface quality: surface smoothness requirements
rb Dangerous defects: cracks, inward folds, outward folds, broken layers, delamination, scarring, dents, convex bulges, etc.
rb b. General defects: pockmarks, green lines, scratches, bumps, slight inner and outer straights, roller marks, etc.
rb