ASTM A213 T12 Alloy Steel Pipe for Boilers

If you are seeking reliable ASTM A213 Grade T12 alloy steel seamless boiler tubes for high-temperature and high-pressure boiler and heat exchange systems, we offer ASTM A213 T12 alloy seamless tubes produced via either hot-finishing or cold-finishing processes. These tubes undergo rigorous normalizing and tempering heat treatments, endowing them with exceptional high-temperature creep resistance. This effectively resolves common industrial issues such as creep deformation, tube rupture, thermal fatigue failure, dimensional instability, and shortened service life under prolonged high-temperature operating conditions.

 

ASTM A213 T12 alloy tubes, specifically designed for heat exchangers, undergo comprehensive pickling and passivation treatments. Consequently, both their inner and outer surfaces feature a roughness value of Ra ≤0.8 μm and are entirely free from defects such as mill scale, pitting, and scratches. This reduces fluid flow resistance, boosts heat exchange efficiency by over 15%, and prevents premature perforation caused by erosion-corrosion.

 

Our ASTM A213 Grade T12 alloy steel tubes strictly adhere to the ultra-fine tolerance requirements stipulated in the ASTM A213 standard: outer diameter tolerance is controlled within ±0.08 mm, roundness is ≤0.05 mm, straightness is ≤0.5 mm/m, and wall thickness eccentricity is ≤8%. This completely eliminates issues-such as insertion difficulties, tube sheet hole wear, and unbalanced expansion stresses-that typically arise during the mass assembly of hundreds or thousands of tubes due to oversized outer diameters, poor straightness, or uneven wall thickness. Furthermore, it enhances the efficiency of automated tube insertion processes by over 30%.

 

 

Regarding hardness, we strictly maintain the material within a premium machinability range of 140–155 HBW-well below the 163 HBW upper limit prescribed by the ASTM A213 standard. This prevents issues such as excessive springback and weld cracking that can occur during the tube expansion process if the material is excessively hard, thereby ensuring a 100% successful expanded seal and stable welding performance.

 

ASTM A213 T12 Alloy Steel Boiler Tube Specification

Manufacturing Process: Seamless (Hot-finished or Cold-finished)
Wall Thickness (WT): 0.9 mm – 12.7 mm
Outer Diameter (OD): 12.7 mm – 127 mm
Length: 6 meters, or customized to specified lengths upon request
Tube End Types: Plain, Beveled, or Threaded
Price Range: FOB USD 1,280 – 1,680 / Ton
Payment Terms: T/T (Telegraphic Transfer), L/C (Letter of Credit)
Delivery Time: 7–15 days after payment
Surface Treatment: Varnished exterior surface for rust protection
Marking: Standard No. + Steel Grade + Dimensions + Heat No. + Batch No.

 

Chemical Composition of ASTM A213 T12 Seamless Boiler Tubes

Grade	Chemical Composition(%)
	C	Mn	P	S	Si	Cr	Mo
A213 T12	0.05-0.15	0.30-0.60	≤0.025	≤0.025	≤0.50	0.80-1.25	0.45-0.65

Mechanical Properties of ASTM A213 T12 Seamless Boiler Tubes

Low Alloy Steels
Grade	UNS Designation	Tensile Strength, min, ksi [MPa]	Yield Strength, min, ksi [MPa]	Elongation in 2 in. or 50 mm, min, %	Hardness
					Brinell/Vickers	Rockwell
T12	K11562	60 [415]	32 [220]	30	163 HBW/ 170 HV	85 HRB

Mechanical property requirements do not apply to tubing smaller than 1 ⁄ 8in. [3.2 mm] in inside diameter or thinner than 0.015 in. [0.4 mm] in thickness.

 

ASTM A213 T12 Alloy Steel Pipe Tolerances of Length

Method of Manufacture	Specified Outside Diameter, in.[mm]	Cut Length, in. [mm]
		Over	Under
Seamless, hot-finished	All sizes	3 ⁄ 16 [5]	0 [0]
Seamless, cold-finished	Under 2 [50.8]	1 ⁄ 8 [3]	0 [0]
	2 [50.8] or over	3 ⁄ 16 [5]	0 [0]
	2 [50.8] or over	3 ⁄ 16 [5]	0 [0]

 

 

Ordering Information

It shall be the responsibility of the purchaser to specify all requirements that are necessary for products.
(1) Quantity (feet, metres, or number of lengths),
(2) Name of material (seamless tubes),
(3) Grade (T22),
(4) Condition (hot finished or cold finished),
(5) Size (outside diameter and minimum wall thickness, unless average wall thickness is specified),
(6) Length (specific or random),
(7) Hydrostatic Test or Nondestructive Electric Test,

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 Tests
(1)Tension test--One tension test shall be made on a specimen from one tube for lots of not more than 50 tubes. Tension tests shall be made on specimens from two tubes for lots of more than 50 tubes.
(2)Hardness Requirements-- Brinell, Vickers, or Rockwell hardness tests shall be made on specimens from two tubes from each lot.
(3)Flattening Test--One flattening test shall be made on specimens from each end of one finished tube.
(4)Flaring Test--One flaring test shall be made on specimens from each end of one finished tube.

 

ASTM A213 T12 Seamless Boiler Tubes Marking

In addition to the marking prescribed in Specification ASTM A1016/A1016M, the marking shall indicate whether the tube is hot-finished or cold-finished.

Our ASTM A213 T12 alloy steel tubes are meticulously packaged to ensure safe transit and preserve the integrity of the material. Each tube is cleaned, oiled, and wrapped in a moisture-proof protective film to prevent corrosion during storage and transportation. The tubes are bundled according to standard weights-typically ranging from 1 to 2 metric tons per bundle-and reinforced with steel strapping to prevent shifting during transit.