Stainless U tubing Home>Products>Stainless U tubing

Stainless bending tubes ASTMA213 TP347H

Nickel Alloy steel pipes:

UNS N04400,  2.4816 Alloy 600,  

Specification:O.D.6-530mm W.T.0.5-40mm  L max 24000mm
ASTM/ASME:A213/SA213 A249/SA249 A268 A312/SA312 A269 A270 A358 A376 A409 A511 A688 A789 A790 A803 A928 A544 A409 A632 A688

 A778 A908 SB161 SB163 SB167 SB338 SB407 SB423 SB444 SB619 SB622 SB626 SB668 SB677 SB829
JIS:G3459 G3446 G3447 G3448 G3459 G3463 G3468
DIN:17455 17456 17457 17458 17459 2391 2462
EN:10216-5 10217-7
GOST9941 GOST9940

Materials:304/304L/304H;321/321H;316/316L/316H;316TI;317L;347H;310S;UNS31803;UNS32750/U NS08904L,TP410/TP410S;ECT

Delivery condition: Normal annealing+Tempered;Brighting annealing;BK;Pickled;

Packing:Plastic plugs in both ends, Hexagonal bundles of max. 2,000kg with several steel strips, Two tags on each bundle, Wrapped in waterproof paper,

PVC sleeve, and sackcloth with several steel strips;wooden case packing with steel frame;
Test:Chemical Component Analysis, Mechanical Properties (Ultimate tensile strength, Yield
strength, Elongation), Technical Properties (Flattening Test, Flaring Test, Bending Test, Hardness Test, Blow Test, Impact Test etc), Exterior Size Inspection.
Mill Test Certificate:EN 10204/3.1B

Classification Society Criterion:CSS、DNV、GL、LR、NK、KR、ABS、BV


U tubes

7.7.2 U – tubes shall meet following requirements:

A. All tubes shall be seamless and Normalized.

B. Tubes shall be cold bent (see also para.8.10.5).

C.Unroundness of the bent section shall not exceed +6% of tube nominal diameter.

E. The bending radius shall not be less than1.5 times the tube nominal diameter.

F. Each U – tube shall be formed from a single length. The length specified shall

be the straight length measured from end to return bend tangent.

G. If temperature differential of over 110°C. occurs between legs of any U–tube,

stress analysis is required to keep stresses within permitted limits.

H. Minimum wall thickness in the bent portion before bending shall be in

accordance with TEMA.Also, refer to RCB-2.323, IPS-G-ME-220.

Material of tube baffles, spacers, and tie rods, shall be compatible with tube

material. For example carbon steel baffles should not be used with nonferrous or

stainless steel tubes. Any exceptions shall be specified on the Process Data


All carbon steel “U” bends shall be stress relieved after bending including a

minimum of 600mm from tangent point in accordance with ASME Code. As a

minimum the requirements for spot radiography shall be met.




PWHT as per code.

Contact Us

Contact Us
  • Jiangyin Donghao Stainless Steel Tube Co.,Ltd
  • Add:No.88,Zhenyang Road, Qingyang Town, Jiangyin City, Jiangsu Province,People's Republic of China.
  • Tel:0086-512-58220050
  • Fax:0086-512-58810865
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