ASTM A179 Seamless Cold Drawn Steel Tube for High Pressure Boiler Service
Product Details
precision stainless steel tubing
,seamless carbon steel tube
ASTM A179 Seamless Steel Tube For High Pressure Service for Boiler
Size: Outer Diameter: 6-1000 mm,Wall Thickness: 1- 80 mm,Length :1-12m or as your request
Application:Manufacture of Feedwater Heater
Material:10#.20#.16Mn.A106(B,C).ST35-ST52
Manufacture :Tubes shall be made by the seamlessprocess and shall be cold drawn.
Heat Treatment:
1)Cold-drawn tubes shall be heat treated after the finalcold-draw pass at a temperature of 1 200F [640C] or higher toensure ductility satis factory for rolling into tube sheets and tomeet mechanical properties as specified.
2)If stress -relief anneal of the U-bends is specified, theanneal shall consist of heating the bent portion within a rangeof 1100 to 1200F [585 to 640C].
Mechanical Tests Required:
1)Flattening Test One flattening test shall be made onspecimens from each end of two tubes selected from each lot(see Note l) or fraction thereof.
2)Flaring Test One flaring test shall be made on speci-mens from each end of two tubes selected from each lot (seeNote l) or fraction thereof. These tubes shall be selected apartfrom those used for the flattening test.
3)Hardness I Test Brinell or Rockwell hardness testsshall be made on specimens from two tubes from each lot. Theterm lot applies to all tubes prior to cutting, of the samenominal diameter and wall thickness which are produced fromthe same heat of steel. When final heat treatment is in abatch-type furnace, a lot shall include only those tubes of thesame size and the same heat which are heat treated in the samefurnace charge. When the final heat treatment is in a continuousfurnace, a lot shall include all tubes of the same size and heat,heat treated in the same furnace at the same temperature, timeat heat, and furnace speed.
4)Hydrostatic Test .Each tube shall be subjected to thehydrostatic pressure test, or instead of this test, a nondestruc-tive test may be used when specified by the purchaser.
Outside diameter and wall thickness allow deviation mm
| sort code | Manufacturing method | Steel tube size | Allowable deviation | |
| WHR (WHEX) | Hot rolled(extruded)steel tube | OD | all | ±1%Dor±0.50(choose the bigger) |
| WT | ≤20 | -15% +0.45 -10%S or –0.30 (choose the bigger) | ||
| ＞20 | ±10%S | |||
| WHE | Heat expand steel tube | OD | all | ±1%D |
| WT | all | ±15%S | ||
| WCD (WCR) | Cold drawn(rolled) steel tube | OD | ≤30 | ±0.20 |
| 30＜D≤50 | ±0.30 | |||
| ＞50 | ±0.8%D | |||
| WT | 1.5≤S≤3 | +12.5% -10% S | ||
| ＞3 | ±10%S | |||
Bending of steel tube per meter
| OD/mm | Bending per meter(mm/m) |
| ≤15 | ≤1.5 |
| ＞15~30 | ≤2.0 |
| ＞30 or D≥351 | ≤3.0 |
What is your Guarantee?
1.SO9001:2008 and TS16949 certification, SGS, BV, TUV or other third party inspection is available.
2.High quality with competitive price.
3.Advanced technology, experienced engineer, ISO quality system for quality assurance and traceability.
Do you have agent or distributor in our country?
1.We are recruiting area agent and distributor all over the world, welcome to send us your mail or call us for detail discussion.
How is your production capability?
1.2000 tons monthly production capacity, 5000 tons monthly trading capability
2.Prompt and Timely shipment
How to get the sample?
1.You are requested to pay for sample charges and courier charges from China to your country; and the free sample is according the product like size, steel grade and quantity, please consult our sales for details
2.Sample charges will be refunded when order is placed.
What is your Payment Term?
1.T/T: 30% deposit in advance, the balance 70% paid before shipment
2.30% down payment, the balance 70% paid against L/C at sight
3.Upon negotiation
Who are your customers?
1.Stockists, Distributors,Wholesalors,Agents, Traders, End Users, etc
How long will you react on our requirement?
1.Your requirement would be treated within 24 hours on weekdays. Quotations would be sent upon technical details confirmed by customer!
Any more questions about your doubts, please feel free to send us your emails or call!
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