Carbon Steel SA178 APH Exchanger Tubes

Carbon Steel SA178 APH Exchanger Tubes carry hot flue gas through air pre-heaters, where they recover waste heat and cut boiler fuel consumption. Engineers specify them for electric-resistance-welded construction, tight wall tolerances, and testing under ASTM A178. Buyers can connect with verified suppliers and manufacturers listed on this B2B portal.

Carbon Steel SA178 APH Exchanger Tube Price

Grade, wall thickness, and order volume move the price of these tubes more than any other inputs. The two reference points and three cost drivers below help you set a budget before you request quotes.

Price Per Kg

ASTM A178 heat exchanger tubes sell in India at roughly INR 75 to INR 140 per kg, depending on grade, dimensions, and testing scope.

Factors Affecting Price

Three factors shape the final quotation. Raw material rates come first, since hot-rolled coil and manganese prices change month to month. Tube dimensions follow, because a larger outer diameter and a heavier wall add weight and cost per metre. Grade and testing requirements complete the list: Grade D, third-party inspection, extra non-destructive testing, and cut-to-length orders all raise the rate.

Carbon Steel SA178 APH Exchanger Tube Specifications

The table below summarises the core specification of ERW tubes supplied under this standard.

SA178 APH Exchanger Tube Chemical Composition

Chemistry separates the three grades. Grade A runs lowest in carbon, while Grade D adds manganese and silicon for strength. The table lists heat analysis limits in percent by weight.

Mechanical Properties of SA178 APH Exchanger Tube

Strength rises from Grade A to Grade D, while elongation drops from 35% to 30%. Use the table to match tube strength to your design pressure and metal temperature.

ASTM SA178 Grades Available

ASTM SA178 covers carbon steel boiler and superheater tubes in three grades.

Each grade offers different carbon, manganese, and tensile-strength levels for varying pressure duties.

Grade A 

Grade A suits the lowest-pressure duty. It uses low-carbon steel with 0.06 to 0.18% carbon, which gives easy forming and welding but caps tensile strength at a 325 MPa minimum.

Grade C 

Grade C raises the carbon limit to 0.35% and the tensile minimum to 415 MPa, so it fits boiler and superheater tubes under higher loads.

Grade D 

Grade D adds manganese at 1.00 to 1.50% and reaches 485 MPa, the highest strength in the standard.

SA178 APH Exchanger Tube Dimensions and Sizes

Most buyers order by outer diameter and wall thickness, then add a cut length. The table shows the common ranges; confirm exact availability with the supplier.

Carbon Steel SA178 APH Exchanger Tube Applications

These tubes serve heat recovery duty wherever hot gas must transfer energy to air or water. The six applications below account for most orders.

• Boiler air pre-heaters
• Power plant economizers
• Low-pressure boiler superheater sections
• Refinery fired heaters 
• Cement and steel plants
• Shell and tube heat exchangers in process plants

ASTM A178 / ASME SA178 Standards and Requirements

ASTM A178 / ASME SA178 specifies the requirements for electric-resistance-welded boiler and superheater tubes. The table below summarizes its key material, testing, dimensional, and documentation requirements.

Buy Carbon Steel SA178 APH Exchanger Tubes from Suppliers

Quality, delivery time, and documentation vary between sources, so screen each supplier against six checks before you place a purchase order. Every manufacturer and supplier on The Piping Mart lists its own range, and you deal with them directly.

Evaluate technical expertise: Look for working knowledge of ASTM, ASME, and EN standards, plus the ability to issue material test reports and third-party inspection certificates on request.

Check grade availability and range: Confirm stock of Grades A, C, and D across your required outer diameters and wall thicknesses. Thin inventory delays project schedules.

Verify certifications and testing: Ask for ISO 9001 certification and in-house hydrostatic, hardness, flattening, and non-destructive testing as a minimum.

Examine raw material sourcing: Prime tubes start with certified coil from steel mills that provide traceable mill certificates for every heat.

Assess customisation capabilities: Check whether the supplier cuts to length, bevels ends, and supplies non-standard sizes without outsourcing.

Review delivery and capacity: Compare lead times for stock items and special orders. Reach out to confirm availability before you finalise a bulk order of ASTM A178 heat exchanger tubes.