Alloy Steel

ASTM A213 T5 Boiler Tube

High-Temperature & Corrosion-Resistant 5Cr-0.5Mo UNS K41545 Seamless Superheater & Heat Exchanger Tubes

Grade ASTM A213 Grade T5 (UNS K41545 / 5Cr-0.5Mo), Grade T5b (UNS K51545), Grade T5c (UNS K41245 / Titanium Stabilized)
Standard ASTM A213, ASME SA213, ASTM A450, ASME B36.10M, IBR (Indian Boiler Regulations), EN 10216-2, DIN 17175 (12CrMo19-5), GOST 550-75 (15Ch5M)
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Product Overview

Om Export India Pvt Ltd is a premier manufacturer, stockist, and global exporter of high-integrity ASTM A213 T5 Seamless Alloy Steel Tubes (ASME SA213 Grade T5 / UNS K41545), including modified variants Grade T5b and Titanium-stabilized Grade T5c. Engineered with a nominal composition of 5% Chromium and 0.5% Molybdenum, Grade T5 is an intermediate ferritic-martensitic alloy steel tailored specifically for severe elevated-temperature service, high-sulfur refinery streams, superheaters, reheaters, economizers, and catalytic cracker heat exchanger circuits operating up to 650°C (1200°F).

The 5% Chromium addition provides superior resistance to hot sulfur corrosion, petroleum oil vapor attack, hydrogen attack, and high-temperature scaling compared to lower alloy grades such as T2 or T11. The Molybdenum addition prevents microstructural softening and guarantees high creep rupture strength under prolonged thermodynamic stresses. Fully certified under Indian Boiler Regulations (IBR) and ASME Section II, our SA213 T5 tubes are supplied in full isothermal annealed or normalized and tempered conditions to ensure optimal ductility for roller expansion into tubesheets, flanging, and precision U-bending.

  • Sulfidation & Scaling Resistance: 5% Chromium matrix provides exceptional resistance to high-temperature naphthenic acid and sulfurous hydrocarbon environments.
  • Creep Rupture Durability: Engineered for sustained cyclic mechanical and thermal stresses in utility boiler banks and cracking coils.
  • IBR Form III-D Compliance: Inspected and certified under Indian Boiler Regulations for high-pressure steam boilers and superheaters.

Key Features

  • High Sulfidation Resistance: 5% Chromium matrix provides resistance against hot sulfur and hydrogen attack.
  • Elevated Temperature Creep Strength: Molybdenum alloying prevents softening and grain boundary separation up to 650°C.
  • Precise Formability: Over 30% elongation ensures cracking-free cold flanging, tight U-bending, and expansion into tubesheets.
  • Controlled Hardness Limits: Maintained under 163 HBW to avoid stress corrosion cracking and hydrogen embrittlement.
  • Thermal Stability: Resists scaling, graphitization, and thermal fatigue across cyclic heating-cooling loops.
  • Smooth Surface Finish: Cold drawn, pickled, and passivated finishes ensure low fluid flow friction and minimal fouling.

Product Specifications

Parameter Standard Specification / Technical Value
Outside Diameter (OD) 6.35 mm to 101.60 mm (1/4" to 4" OD) / Custom up to 228.6 mm for Hot Finished
Wall Thickness (WT) 0.028" to 0.750" (0.71 mm to 19.05 mm) / 10 SWG to 20 SWG / SCH 40, SCH 80, SCH 160
Manufacturing Methods Cold Drawn Seamless (CDS) and Hot Finished Seamless (HFS)
Heat Treatment Full Annealed, Isothermal Annealed, or Normalized (1750°F / 955°C) & Tempered (Min: 1250°F / 675°C)
Standard Lengths Single Random, Double Random, Standard 6m / 12m, Continuous Lengths up to 25,000 mm (25m)
End Configurations Plain Square Cut End (PE), Beveled End (BE 30°/37.5° per ASME B16.25), Threaded & Coupled
Operating Limits Continuous service up to 1200°F (650°C); design pressure ratings exceeding 30 bar
Testing & Certifications IBR (Form III-D / III-A), NACE MR0175/ISO 15156, 100% Eddy Current / Ultrasonic, EN 10204 3.1 & 3.2

Dimensions & Sizes

Outside Diameter (OD in / mm) Wall Thickness (WT in / mm / SWG) Inside Diameter (ID in / mm) Weight per Foot (lb/ft) Weight per Meter (kg/m)
1/4" OD (6.35 mm) 0.028" (0.71 mm / 22 SWG) 0.194" (4.93 mm) 0.067 lb/ft 0.100 kg/m
1/4" OD (6.35 mm) 0.035" (0.89 mm / 20 SWG) 0.180" (4.57 mm) 0.080 lb/ft 0.119 kg/m
1/4" OD (6.35 mm) 0.049" (1.24 mm / 18 SWG) 0.152" (3.87 mm) 0.105 lb/ft 0.156 kg/m
3/8" OD (9.53 mm) 0.035" (0.89 mm / 20 SWG) 0.305" (7.75 mm) 0.127 lb/ft 0.189 kg/m
3/8" OD (9.53 mm) 0.049" (1.24 mm / 18 SWG) 0.277" (7.05 mm) 0.171 lb/ft 0.254 kg/m
3/8" OD (9.53 mm) 0.065" (1.65 mm / 16 SWG) 0.245" (6.23 mm) 0.215 lb/ft 0.320 kg/m
1/2" OD (12.70 mm) 0.035" (0.89 mm / 20 SWG) 0.430" (10.92 mm) 0.174 lb/ft 0.259 kg/m
1/2" OD (12.70 mm) 0.049" (1.24 mm / 18 SWG) 0.402" (10.22 mm) 0.236 lb/ft 0.351 kg/m
1/2" OD (12.70 mm) 0.065" (1.65 mm / 16 SWG) 0.370" (9.40 mm) 0.302 lb/ft 0.449 kg/m
1/2" OD (12.70 mm) 0.083" (2.11 mm / 14 SWG) 0.334" (8.48 mm) 0.370 lb/ft 0.551 kg/m
5/8" OD (15.88 mm) 0.049" (1.24 mm / 18 SWG) 0.527" (13.40 mm) 0.301 lb/ft 0.448 kg/m
5/8" OD (15.88 mm) 0.065" (1.65 mm / 16 SWG) 0.495" (12.58 mm) 0.389 lb/ft 0.579 kg/m
3/4" OD (19.05 mm) 0.049" (1.24 mm / 18 SWG) 0.652" (16.57 mm) 0.367 lb/ft 0.546 kg/m
3/4" OD (19.05 mm) 0.065" (1.65 mm / 16 SWG) 0.620" (15.75 mm) 0.476 lb/ft 0.708 kg/m
3/4" OD (19.05 mm) 0.083" (2.11 mm / 14 SWG) 0.584" (14.83 mm) 0.592 lb/ft 0.881 kg/m
3/4" OD (19.05 mm) 0.109" (2.77 mm / 12 SWG) 0.532" (13.51 mm) 0.746 lb/ft 1.110 kg/m
1" OD (25.40 mm) 0.049" (1.24 mm / 18 SWG) 0.902" (22.92 mm) 0.498 lb/ft 0.741 kg/m
1" OD (25.40 mm) 0.065" (1.65 mm / 16 SWG) 0.870" (22.10 mm) 0.649 lb/ft 0.966 kg/m
1" OD (25.40 mm) 0.083" (2.11 mm / 14 SWG) 0.834" (21.18 mm) 0.813 lb/ft 1.210 kg/m
1" OD (25.40 mm) 0.109" (2.77 mm / 12 SWG) 0.782" (19.86 mm) 1.037 lb/ft 1.543 kg/m
1-1/4" OD (31.75 mm) 0.065" (1.65 mm / 16 SWG) 1.120" (28.45 mm) 0.823 lb/ft 1.225 kg/m
1-1/4" OD (31.75 mm) 0.095" (2.41 mm / 13 SWG) 1.060" (26.93 mm) 1.172 lb/ft 1.744 kg/m
1-1/2" OD (38.10 mm) 0.065" (1.65 mm / 16 SWG) 1.370" (34.80 mm) 0.996 lb/ft 1.482 kg/m
1-1/2" OD (38.10 mm) 0.120" (3.05 mm / 11 SWG) 1.260" (32.00 mm) 1.769 lb/ft 2.632 kg/m
2" OD (50.80 mm) 0.083" (2.11 mm / 14 SWG) 1.834" (46.58 mm) 1.698 lb/ft 2.527 kg/m
2" OD (50.80 mm) 0.120" (3.05 mm / 11 SWG) 1.760" (44.70 mm) 2.410 lb/ft 3.586 kg/m

Chemical Composition

Grade / UNS C (%) Mn (%) P (%) Max S (%) Max Si (%) Cr (%) Mo (%) Ti (%)
Grade T5 (UNS K41545) 0.15 Max 0.30 – 0.60 0.025 0.025 0.50 Max 4.00 – 6.00 0.45 – 0.65 —
Grade T5b (UNS K51545) 0.15 Max 0.30 – 0.60 0.025 0.025 1.00 – 2.00 4.00 – 6.00 0.45 – 0.65 —
Grade T5c (UNS K41245) 0.12 Max 0.30 – 0.60 0.025 0.025 0.50 Max 4.00 – 6.00 0.45 – 0.65 4x C Min – 0.70 Max

Mechanical Properties

Mechanical Property Grade T5 (UNS K41545) Grade T5b (UNS K51545) Grade T5c (UNS K41245)
Tensile Strength (Min) 415 MPa (60 ksi) 415 MPa (60 ksi) 415 MPa (60 ksi)
Yield Strength (0.2% Offset, Min) 205 MPa (30 ksi) 205 MPa (30 ksi) 205 MPa (30 ksi)
Elongation in 2 in. / 50 mm (Min) 30% Min 30% Min 30% Min
Hardness (Brinell, Max) 163 HBW Max (85 HRB) 179 HBW Max (89 HRB) 163 HBW Max (85 HRB)
Flattening Test Passes per ASTM A450 Passes per ASTM A450 Passes per ASTM A450
Flaring / Expansion Test 30% Expansion over 60° Cone 30% Expansion over 60° Cone 30% Expansion over 60° Cone

Standards & Specifications

Standard Designation Governing Body / Region Grade / Material Scope
ASTM A213 / ASME SA213 ASTM / ASME (USA) Grade T5, T5b, T5c (UNS K41545, K51545, K41245) – Seamless Ferritic Boiler & Heat Exchanger Tubes
ASTM A335 / ASME SA335 ASTM / ASME (USA) Grade P5 (Nominal Pipe Equivalent)
Indian Boiler Regulations (IBR) Central Boilers Board (India) IBR Certified SA213 Grade T5 Boiler Tubing
EN 10216-2 / DIN 17175 European Union / Germany 12CrMo19-5 / Material No. 1.7362 Seamless Steel Tubes for Elevated Temperature
GOST 550-75 GOST (Russia / CIS) 15Ch5M / 15Х5М Seamless Steel Tubes for Petrochemical Refineries
ASTM A450 / A1016 ASTM International Standard Specification for General Requirements for Ferritic Alloy Steel Tubes

Applications

Mechanical Property Grade T5 (UNS K41545) Grade T5b (UNS K51545) Grade T5c (UNS K41245)
Tensile Strength (Min) 415 MPa (60 ksi) 415 MPa (60 ksi) 415 MPa (60 ksi)
Yield Strength (0.2% Offset, Min) 205 MPa (30 ksi) 205 MPa (30 ksi) 205 MPa (30 ksi)
Elongation in 2 in. / 50 mm (Min) 30% Min 30% Min 30% Min
Hardness (Brinell, Max) 163 HBW Max (85 HRB) 179 HBW Max (89 HRB) 163 HBW Max (85 HRB)
Flattening Test Passes per ASTM A450 Passes per ASTM A450 Passes per ASTM A450
Flaring / Expansion Test 30% Expansion over 60° Cone 30% Expansion over 60° Cone 30% Expansion over 60° Cone

Frequently Asked Questions

ASTM A213 T5 seamless alloy steel tubes are utilized across heavy process, refinery, and power generation infrastructure:

  • Oil Refineries & Petrochemicals: Hydrodesulfurization units, delayed coking furnaces, thermal cracking heaters, and crude distillation overhead condensers.
  • Utility & Industrial Boilers: Superheater tube pendants, reheater loops, boiler waterwalls, and high-temperature steam distribution lines under IBR.
  • Process Heat Exchangers: High-sulfur process gas coolers, transfer lines, shell and tube vaporizers, and reboilers.
  • Corrosive Fluid Transmission: High-pressure transport of hot petroleum hydrocarbons containing sulfur compounds and naphthenic acids.
  • High-Pressure Instrumentation: Cold-drawn small-bore impulse tubing for toxic, flammable, and severe thermal process controls.

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