Quality inspection method of seamless steel pipe
1. Chemical composition analysis: chemical analysis method, instrument analysis (infrared C-S instrument, direct reading spectrometer, zcP, etc.).
① Infrared C-S instrument: analysis of ferroalloy, steelmaking raw materials, C, S elements in steel.
② Direct reading spectrometer: C, Si, Mn, P, S, Cr, Mo, Ni, Cn, A1, W, V, Ti, B, Nb, As, Sn, Sb, Pb, Bi in the block samples
③ N- -0 instrument: gas content analysis N and O.
2. Surface quality inspection of steel pipe: 100%
① Manual visual inspection: lighting conditions, standards, experience, identification, steel pipe rotation.
② NDT inspection:
A. Ultrasonic detection UT:
B. ET: (electromagnetic induction)
C. MT and leakage detection:
Magnetic flaw detection, suitable for the detection of surface and near-surface defects of ferromagnetic materials.
D. Electromagnetic ultrasonic flaw detection:
No coupling medium is needed, which can be applied to high temperature and high speed, rough and dry steel pipe surface flaw detection.
E. liquid penetrating test:
Fluorescence, coloring, and detecting of steel pipe surface defects.
3. Physical and chemical performance inspection of steel pipe:
① Tensile test: measure the stress and deformation, determine the strength of the material (YS, TS) and plastic index (A, Z)
Longitudinal, transverse section, arc, circular (￠ 10, ￠ 12.5)
Small diameter, thin wall, large diameter, thick wall calibration distance.
② Impact test: CVN, notch C, V, work J value J / cm2
Standard sample 101055 (mm) Non-standard sample 55 5 (mm)
③ Hardness test: Brinell hardness HB, Rockell hardness HRC, Vickers hardness HV, etc
④ Hydraulic test: test pressure, stabilization time, p=2S δ / D
4. Process performance inspection of steel pipe:
① Flat test: round sample C-shaped sample (S / D & gt; 0.15) H= (1 + 2) S / (+ S / D)
L=40~100mm per unit length deformation coefficient =0.07~0.08
② Pull test: L=15mm without crack is qualified
③ Expansion and curling test: the top taper is 30°, 40° and 60°
④ Bending test: can replace the flattening test (for large diameter pipe).
Product Detail
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Steel Grade:
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106B,210A1,210C,P9,P11,T1,T11,T2,T5,T12,T22,T23,T91,T92,P235GH,13CrMo4-5,15Mo3,10CrMo9-10,
ST35.8,ST45.8,STB340,STBA 12-2,API5L,5CT |
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Standard:
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ASME/ASTM SA/A53/513/106/209/210/213/335/178/179/519
ASME/ASTM SA/A213,A312,A269,A778,A789,
DIN 17456, DIN17457,DIN 17459,DIN17175,EN10216,BS3605,BS3059 |
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Specification:
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Outdiameter 10~508mm |
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Wt:
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1.0-30mm,or according to customer's special request |
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Length:
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2-20meters,or according to customer's special request |
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Package:
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Export Standard Package |
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Typies of tube:
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Boiler tube,precision tube,mechanical tubing,cylinder tube,line pipes,etc |
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Mill MTC:
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Supplied before shipment |
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Inspection:
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The Third Party inspection can be accepted,SGS,BV,TUV |
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Mount port:
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Any port in China |
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Trade Term:
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FOB,CIF,CFR,EXW,etc. |
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Price Term:
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TT or LC at sight |
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Our services:
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We can customized according to customer's requriement or drawing ,packaging according to customers' request |
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