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

簡単な説明:

GB T3087-2008

低圧中圧ボイラー配管過熱蒸気管高品質のシームレスな炭素鋼パイプ

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.
  • 製品の詳細

    よくある質問

    商品のタグ

    概要

    標準:GB / T3087-2008

    グレードグループ:10#、20#

    厚さ:1〜100ミリメートル

    外径(ラウンド):10〜1000ミリメートル

    長さ:固定長またはランダムな長さ

    断面形状:ラウンド

    原産地:中国

    認証:ISO9001:2008

     

    合金かどうか:シームレス炭素鋼

    アプリケーション:ボイラーパイプ

    表面処理:顧客の要件として

    テクニック:ホット圧延/風邪を引きます

    熱処理:ノーマライズ

    特殊パイプ:厚壁パイプ

    使用法:建設、流体輸送、ボイラーや熱交換器

    テスト:ET / UT

    応用

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

    主なグレード

    高品質の炭素構造用鋼のグレード:10#、20#

     

    ケミカルコンポーネント

    標準 グレード 化学組成(%)
    C Siの マンガン P S クロム ニッケル
    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

    機械的特性

    標準 鋼管 壁の厚さ 引張強さ 降伏強度 伸長
    GB3087 (んん) (MPa)と (MPa)と
    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 壁の厚さ Permissible deviation
    Cold drawn (rolled) steel tube ≤ 3 15 - 10 % S or ± 0.15, take the greater number
    > 3 + 12.5% S
    - 10% S

    テスト要件

    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.

     

    製品の詳細


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