China GB 3087 standard seamless boiler alloy steel pipe Low pressure Medium pressure Manufacturer and Supplier | Gold Sanon
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GB 3087 standard seamless boiler alloy steel pipe Low pressure Medium pressure

간단한 설명:

GB T3087-2008

저압 중간 압력 보일러 파이프 과열 증기 파이프 높은 품질의 원활한 탄소 강관

Mainly for India market with IBR certification


  • Payment: 30% deposit, 70% L/C or B/L copy or 100% L/C at sight
  • Min.Order Quantity: 1 PC
  • Supply Ability: Annual 20000 Tons Inventory of Steel Pipe
  • Lead Time: 7-14 days if in stock, 30-45 days to produce
  • Packing: Black Vanishing, bevel and cap for every single pipe; OD below 219mm need to pack in bundle, and each bundle no exceed 2 tons.
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    자주하는 질문

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    개요

    표준 : GB / T3087-2008

    학년 그룹 : 10 #, 20 #

    두께 : 1~1백mm

    외경 (라운드) : 10-1,000밀리미터

    길이 : 고정 길이 또는 임의의 길이

    섹션 모양 : 라운드

    기원의 장소 : 중국

    증명서 : ISO9001 : 2008

     

    합금 여부 : 원활한 탄소강

    응용 프로그램 : 보일러 파이프

    표면 처리 : 고객의 요구 사항으로

    기술 : 열간 압연 / 감기 그려

    열처리 : 정규화

    특수 파이프 : 두꺼운 벽 파이프

    사용법 : 건축, 유체 교통, 보일러 및 열교환 기

    테스트 : ET / UT

    신청

    It is mainly used to make high-quality carbon structural steel, low pressure medium pressure boiler pipe, super heated steam seamless carbon steel pipe

    홈페이지 등급

    고품질의 탄소 구조 강철 등급 : 10 #, 20 #

     

    화학 구성 요소

    표준 등급 화학적 구성 요소(%)
    망간 에스 CR 구리 니켈
    GB3087 10 0.07 ~ 0.13 0.17 ~ 0.37 0.38 ~ 0.65 ≤0.030 ≤0.030 0.3 ~ 0.65 ≤0.25 ≤0.30
    20 0.17 ~ 0.23 0.17 ~ 0.37 0.38 ~ 0.65 ≤0.030 ≤0.030 0.3 ~ 0.65 ≤0.25 ≤0.30

    기계적 성질

    표준 쇠 파이프 벽 두께 인장 강도 항복 강도 연장
    GB3087 (mm) (MPA) (MPA) %
    10 / 335 ~ 475 195 24
    20 <15 410 ~ 550 245 20
    ≥15 225

    Tolerance

    Permissible deviation of outer diameter of steel tubes

    Type of steel tube  Permissible deviation
    Hot rolled (extruded, expanded) steel tube ± 1.0% D or ± 0.50, take the greater number
    Cold drawn (rolled) steel tube ± 1.0% D or ± 0.30, take the greater number

    Permissible deviation of the wall thickness of hot rolled (extrusion, expansion) steel tubes

    Unit: mm

    Type of steel tube Outer diameter of steel tube S / D  Permissible deviation
    hot rolled (extruded) steel tube ≤ 102  – ± 12.5 % S or ± 0.40, take the greater number
    > 102 ≤ 0.05 ± 15% S or ± 0.40, take the greater number
    > 0.05 ~ 0.10  ± 12.5% S or ± 0.40, take the greater number
    > 0.10 + 12.5% S
    - 10% S
    hot expand steel tube + 15% S

    Permissible deviation of the wall thickness of cold drawn (rolled) steel tubes

    Unit: mm

    Type of steel tube 벽 두께 Permissible deviation
    Cold drawn (rolled) steel tube ≤ 3 15 - 10 % S or ± 0.15, take the greater number
    > 3 + 12.5% S
    - 10% S

    테스트 요구 사항

    Flattening test

    Steel tubes with an outer diameter greater than 22 mm and up to 400 mm, and wall thickness greater than 10 mm should undergo the flattening test. After the samples are flattened

    Bending test

    Steel tubes with an outer diameter not greater than 22 mm should undergo the bending test. The bending angle is 90o . The bending radius is 6 times the outer diameter of the steel tube.After bending the sample, no fissures or cracks are permitted to appear on the sample.

    Macroscopic examination

    For steel tubes directly made by continuously cast billets or steel ingots, the supplying party should guarantee that there are no white spots, impurities, sub-surface air bubbles, skull patches or layering on the cross-sectional acid pickled macroscopic tissue of the billet or steel tube.

    Non-destructive inspection

    According to the demanding party’s request, which is then negotiated between the supplying and demanding parties and indicated in the agreement, ultrasonic flaw detection may be individually performed for steel tubes. The longitudinal manual defect of the reference sample tube should meet the requirements for post-inspection acceptance grade C8 specified in GB/T 5777-1996.

     

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