<th id="6uwcg"><sup id="6uwcg"></sup></th>
  • <pre id="6uwcg"><em id="6uwcg"></em></pre>
    <code id="6uwcg"><nobr id="6uwcg"><sub id="6uwcg"></sub></nobr></code>
    1. <code id="6uwcg"><nobr id="6uwcg"><track id="6uwcg"></track></nobr></code>
          <code id="6uwcg"><nobr id="6uwcg"></nobr></code>

          Welcome to visit Xuzhou Global Precision Steel Tube Co.,Ltd

          • Wechat

          • Mobile

          Service telephone

          +86-0516-83307968

          Your position:Home - Quality - Standard

          Standard


          Standard:  

                EN_10305_4-2003.zip,EN10305-4(DIN2445/2) , EN10305-1( DIN2391/C) ,GB/T3639, ASTM A179 

          Steel Grade:

           E235 (ST35 ST37.4 10# ) ,E255(ST45 20#) E355 ,(ST52 ST52.4 16Mn)

          Size:

          OD: 4-120mm,  WT: 0.5-10mm, Length:Fixed 6m or as your requirement


          Surface treatment: 

          1.Bright--polishing and do corrosion protection after NBK 

          2.galvanized--this tubes with a zinc coating of 8 to 12μm and subsequently chrome VI-free passivated (yellow and silver);

          3.Phosphated--internal and external phosphated coating

          Heat treatment: 

          +N (NBK) normalized

          Straightness:

           10μm / meter


          Tolerance
          Outer DiameterAllowable tolerancespecial tolerance
          GB/T3639DIN2391ODWT
          4mm-20mm±0.10mm±0.08mm±0.05mm±0.05mm
          20mm-30mm±0.10mm±0.08mm±0.08mm±0.08mm
          31mm-40mm±0.15mm±0.15mm±0.10mm±0.08mm
          41mm-60mm±0.20mm±0.20mm±0.15mm±0.15mm
          61mm-80mm±0.30mm±0.30mm±0.20mm±0.20mm
          81mm-120mm±0.45mm±0.45mm±0.30mm±0.30mm


          老公不在家我经常出轨怎么办,99re视频热这里有精品,办公室被CAO的合不拢腿
          <th id="6uwcg"><sup id="6uwcg"></sup></th>
        1. <pre id="6uwcg"><em id="6uwcg"></em></pre>
          <code id="6uwcg"><nobr id="6uwcg"><sub id="6uwcg"></sub></nobr></code>
          1. <code id="6uwcg"><nobr id="6uwcg"><track id="6uwcg"></track></nobr></code>
                <code id="6uwcg"><nobr id="6uwcg"></nobr></code>