ASTM A178 Electric-Resistance-Welded Carbon Steel and Carbon-Manganese Steel Boiler and Superheater Steel Tube
Application:boiler tubes,boiler flues,superheater flues and safe ends.
Size:L--4~12m
OD--12.7-127mm
WT--0.9-9.1mm
Grade:Type A,C and D
Manufacture :electric-resistance welding.
Heat Treatment:After welding,all tubes shall be heat treated at a temperature of 1650°F[900℃]or higher and followed by cooling in air or in the cooling chamber of a controlled-atmosphere furnace.Cold-drawn tubes shall be heat treated after the final cold-draw pass at a temperature of 1200°F[650℃] or higher.
TABLE 1 Allowable deviation of outer diameter and wall thickness
Unit: millimeter
| Nominal outside diameter D | Allowable deviation of outer diameter | Permissible deviation of wall thickness |
| D≤48.3 | ±0.50 | ±10%S |
48.3 | ±1%D | |
| D>273 | ±0.75%D |
TABLE 2 Mechanical Property
| Grade | Tensile strength
| Lower yield strength | Elongation A% Not less than |
| D≤168.3 | D>168.3 |
| Type A | 375 | 235 | 15 | 20 |
| Type C | 390 | 295 | 13 | 18 |
| Type D | 470 | 345 | 13 | 18 |
| Note : Tensile test arbitration time is based on longitudinal sample. |
Surface Quality:The internal and external surfaces of the steel tube are not allowed to have cracks, scabs, folds, delaminations, laps, and burns. Allows for scribes, scratches, misalignment of welds, burns, oxide scales, and external burr removal traces that are not more than a negative wall thickness deviation
Inspection items:
chemical composition
Tensile test
Ultrasonic examination
Eddy current flaw detection
Bending test
Flattening test
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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