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ASTM A213 Low Alloy Steel Tubes for Boiler, Superheater & Heat-Exchanger

ASTM A213 is the standard specification for seamless ferritic and austenitic alloy-steel boiler, superheater, and heat-exchanger tubes. Hebei Metals supplies Cr-Mo low alloy steel grades of T2, T5, T5b, T5c, T9, T11, T12, T17, T21, T22, T23, T24, T36, T91, T92, T122, and T911. The tubing sizes and thickness usually furnished to this specification are 1/8″(3.2 mm) in inside diameter to 5″(127 mm) in outside diameter and 0.015″ to 0.500″(0.4-12.7 mm) in minimum or average wall thickness. ASTM A213 tubes of custom-diameter may be furnished, provided such tubes comply with all other requirements of the standard specification. The ASTM equivalent steel grades of A213 can be found in ASTM A335.

The heat-exchanger coil made of ASTM A213 T9 tubes.

The heat-exchanger coil made of ASTM A213 T9 tubes.

1. Chemical Composition Requirements

Chemical Composition of ASTM A213 Low Alloy Steels, %
GradeUNSCMnPSSiCrMoOthers
T2K115470.10-0.200.30-0.610.0250.0250.10-0.300.50-0.810.44-0.65-
T5K415450.150.30-0.600.0250.0250.504.00-6.000.45-0.65-
T5bK515450.150.30-0.600.0250.0251.00-2.004.00-6.000.45-0.65-
T5cK412450.120.30-0.600.0250.0250.504.00-6.000.45-0.65*A
T9K909410.150.30-0.600.0250.0250.25-1.008.00-10.000.90-1.10-
T11K115970.05-0.150.30-0.600.0250.0250.50-1.001.00-1.500.44-0.65-
T12K115620.05-0.150.30-0.610.0250.0250.500.80-1.250.44-0.65-
T17K120470.15-0.250.30-0.610.0250.0250.15-0.350.80-1.25--
T21K315450.05-0.150.30-0.600.0250.0250.50-1.002.65-3.350.80-1.06-
T22K215900.05-0.150.30-0.600.0250.0250.501.90-2.600.87-1.13-
T23K407120.04-0.100.10-0.600.0300.0100.501.90-2.600.05-0.30*B
T24K307360.05-0.100.30-0.700.0200.0100.15-0.452.20-2.600.90-1.10*C
T36K210010.10-0.170.80-1.200.0300.0250.25-0.500.300.25-0.50*D
T91K909010.07-0.140.30-0.600.0200.0100.20-0.508.0-9.50.85-1.05*E
T92K924600.07-0.130.30-0.600.0200.0100.508.5-9.50.30-0.60*F
T122K912710.07-0.140.700.0200.0100.5010.0-11.50.25-0.60*G
T911K910610.09-0.130.30-0.600.0200.0100.10-0.508.5-9.50.90-1.10*H

*All values are maximum unless a range is provided or otherwise specified.
*A – Ti:4xC-0.70;
*B – Ni:≤0.40,V:0.20-0.30,B:0.001-0.006,Nb:0.02-0.08,N:≤0.015,Al:≤0.030,W:1.45-1.75,Ti:0.005-0.06,Ti/N≥3.5;
*C – V:0.20-0.30,B:0.0015-0.007,N:≤0.012,AL:≤0.02,Ti:0.06-0.10;
*D – Ni:1.00-1.30,V:≤0.02,Nb:0.015-0.045,N:≤0.02,AL:≤0.050,Cu:0.50-0.80;
*E – Ni:≤0.40,V:0.18-0.25,Nb:0.06-0.10,N:0.03-0.07,Al:0.02,Ti:0.01,Zr:0.01;
*F – Ni:≤0.40,V:0.15-0.25,B:0.001-0.006,Nb:0.04-0.09,N:0.030-0.070,Al:≤0.02,W:1.5-2.00,Ti:0.01,Zr:0.01;
*G – Ni:≤0.50,V:0.15-0.30,B:0.0005-0.005,Nb:0.04-0.10,N:0.040-0.100,Al:≤0.02,W:1.50-2.50,Cu:0.30-1.70,Ti:0.01,Zr:0.01:
*H – Ni:≤0.40,V:0.18-0.25,B:0.0009-0.006,Nb:0.06-0.10,N:0.040-0.090,Al:≤0.02,W:0.90-1.10,Ti:0.01,Zr:0.01;

2. Mechanical Properties

Mechanical Properties of ASTM A213 Low Alloy Steel Tubes
GradeTensile StrengthYield StrengthElongation, %Hardness
ksiMPaksiMPaBrinell/VickersRockwell
T5b604153020530179 HBW/190 HV89 HRB
T9604153020530179 HBW/190 HV89 HRB
T12604153222030163 HBW/170 HV85 HRB
T23745105840020220 HBW/230 HV97 HRB
T24855856041520250 HBW/265 HV25 HRC
T36 Class 1906206444015250 HBW/265 HV25 HRC
T36 Class 295.566066.546015250 HBW/ 265 HV25 HRC
T91855856041520190 to 250 HBW/ 196 to 265 HV90 HRB to 25 HRC
T92906206444020250 HBW/ 265 HV25 HRC
T122906205840020250 HBW/ 265 HV25 HRC
T911906206444020250 HBW/ 265 HV25 HRC
Others*A604153020530163 HB/170 HV85 HRB

*A – All other low alloy steel grades of ASTM A213.

3. Heat Treatment

Heat Treatment Process for ASTM A213 Low Alloy Steel Tubes
GradeHeat Treatment TypeAustenitizing/Solutioning
Temperature, min. or range °F[°C]
Cooling MediaSubcritical Annealing or Tempering
Temperature, min. or range °F[°C]
T2full or isothermal anneal---
normalize and temper---
subcritical anneal--1200-1350[650-730]
T5full or isothermal anneal---
normalize and temper--1250[675]
T5bfull or isothermal anneal---
normalize and temper--1250[675]
T5csubcritical anneal-air or furnace1350[730]
T9full or isothermal anneal---
normalize and temper--1250[675]
T11full or isothermal anneal---
normalize and temper--1200[650]
T12full or isothermal anneal---
normalize and temper---
subcritical anneal--1200-1350[650-730]
T17full or isothermal anneal---
normalize and temper--1200[650]
T21full or isothermal anneal---
normalize and temper--1250[675]
T22full or isothermal anneal---
normalize and temper--1250[675]
T23normalize and temper1900-1975[1040-1080]-1350-1470[730-800]
T24normalize and temper1800-1870[980-1020]-1350-1420[730-770]
T36normalize and temper1650[900]-1100[595]
T91normalize and temper1900-1975[1040-1080]-1350-1470[730-800]
T92normalize and temper1900-1975[1040-1080]-1350-1470[730-800]
T122normalize and temper1900-1975[1040-1080]-1350-1470[730-800]
T911normalize and temper1900-1975[1040-1080]-1365-1435[740-780]

4. Inspection and Tests

Tests or inspection the ASTM A213 tube shall take include: tension test, hardness test, flattening test, flaring test, hydrostatic or any alternative nondestructive(NDT) test, dimension inspection and visual examination.

ASTM A213 T22 tubes, 3"x4mm

ASTM A213 T22 tubes, 3″ W.T=4mm Length=6m.

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Cr-Mo Alloy Steels

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