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  • A106 Carbon Steel Seamless Pipes

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A106 Carbon Steel Seamless Pipes
ASTM A106 carbon steel seamless pipes are manufactured for high-temperature service, suitable for bending, flanging, and similar forming operations. These pipes offer excellent high-temperature strength, good corrosion resistance, and reliable performance in pressure applications.
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◉ PRODUCT SPECIFICATION


1. Material Standards & Grades


Primary Standard:

ASTM A106/A106M - Standard Specification for Seamless Carbon Steel Pipe for High-Temperature Service

Available Grades:

Grade

UNS Designation

Service Temperature

Key Characteristics

Grade A

K02501

Up to 425°C

Standard strength

Grade B

K03006

Up to 425°C

Intermediate strength

Grade C

K03501

Up to 425°C

Higher strength


2. Chemical Composition (% by weight)


Element

Grade A

Grade B

Grade C

Product Analysis Tolerance

Carbon (C)

≤ 0.25

≤ 0.30

≤ 0.35

+0.01%

Manganese (Mn)

0.27-0.93

0.29-1.06

≤ 1.06

+0.03%

Phosphorus (P)

≤ 0.025

≤ 0.025

≤ 0.025

+0.005%

Sulfur (S)

≤ 0.025

≤ 0.025

≤ 0.025

+0.005%

Silicon (Si)

≥ 0.10

≥ 0.10

≥ 0.10

+0.02%

Copper (Cu)

≤ 0.40

≤ 0.40

≤ 0.40

+0.03%

Nickel (Ni)

≤ 0.40

≤ 0.40

≤ 0.40

+0.03%

Chromium (Cr)

≤ 0.40

≤ 0.40

≤ 0.40

+0.03%

Molybdenum (Mo)

≤ 0.15

≤ 0.15

≤ 0.15

+0.02%


3. Mechanical Properties


Property

Grade A

Grade B

Grade C

Test Standard

Tensile Strength (MPa)

≥ 330

≥ 415

≥ 485

ASTM A370

Yield Strength (MPa)

≥ 205

≥ 240

≥ 275

ASTM A370

Elongation (%)

≥ 35

≥ 30

≥ 30

ASTM A370

Hardness (HB)

≤ 143

≤ 163

≤ 179

ASTM E10


4. Physical Properties


Property

Typical Value

Test Standard

Density

7.85 g/cm³

-

Modulus of Elasticity

200 GPa

ASTM E111

Poisson's Ratio

0.30

-

Thermal Expansion Coefficient

11.7 × 10⁻⁶/°C (20-100°C)

ASTM E228

Thermal Conductivity

51.9 W/m·K

ASTM E1225


5. Product Specifications


Parameter

Standard Range

Tolerance

Available Sizes

Outer Diameter

10.3mm - 1219mm

±0.75%

1/8" NPS - 48" NPS

Wall Thickness

1.7mm - 80mm

+12.5%/-10%

SCH 10 - SCH XXS

Length

3-12.5m (Random)

+10mm/-0mm

Up to 18m (Custom)

Straightness

≤ 1mm per meter

-

Tighter tolerances available


6. Manufacturing Process


Production Methods:

  • Hot finished seamless process

  • Cold drawn seamless process

  • Continuous mill process

Heat Treatment:

  • Hot finished pipes: Usually as-rolled

  • Cold drawn pipes: Full annealed or stress relieved

  • Normalizing: Optional for specific requirements


7. Testing & Inspection


Mandatory Tests:

  • Hydrostatic test

  • Non-destructive electric test

  • Tensile test

  • Flattening test

  • Hardness test

Optional Tests:

  • Bend test

  • Impact test

  • Microstructure examination

  • Positive Material Identification (PMI)


8. Applications


Primary Applications:

  • Power Plants: Boiler tubes, superheater tubes

  • Refineries: Process piping, heater tubes

  • Chemical Plants: High-temperature pipelines

  • Oil & Gas: Transmission lines, gathering systems

  • Industrial: Steam lines, heat exchangers

Service Conditions:

  • Maximum temperature: 425°C

  • Pressure rating: Per ASME B31.3

  • Suitable for bending and flanging operations


9. Quality Certification & Documentation


Certification Requirements:

  • Mill Test Certificate 3.1 per EN 10204

  • ASME Nuclear Certificate (if applicable)

  • PED 2014/68/EU Compliance

  • ISO 9001 Quality Management System

Documentation Provided:

  • Chemical analysis report

  • Mechanical test reports

  • Heat treatment records

  • Non-destructive testing reports

  • Hydrostatic test reports


Technical Advantages:

  • Excellent high-temperature strength

  • Good formability and weldability

  • Consistent mechanical properties

  • Reliable performance in pressure service

  • Cost-effective for high-temperature applications


All A106 seamless pipes are manufactured and tested in accordance with ASTM standards and can be supplied with additional testing to meet specific project requirements.

◉ Surfcae selection

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SURFACE CHARACTERISTIC SUMMARY OF MANUFACTURING METHOD APPLICATION
NO.1 Silvery white Hot rolled to specified thickness Do not need to have a glossy surface use
lackluster
NO.2D Silvery white After cold rolling, heat treatment and pickling are carried out General material, deep material
NO.2B Gloss is stronger than No.2D After No.2D treatment, the final light cold rolling is carried out through the polishing roller The general material
BA As bright as a sixpence No standard, but usually a bright annealed surface with high reflectivity. Building materials, kitchen utensils
NO.3 Rough lapping Grind with 100~200# (unit) strop tape Building materials, kitchen utensils
NO.4 Intermediate grinding Polished surface obtained by grinding with 150~180# strop abrasive tape Building materials, kitchen utensils
NO.240 Fine lapping Grinding with 240# strop abrasive tape kitchenware
NO.320 Very fine grinding Grinding was carried out with 320# strop abrasive tape kitchenware
NO.400 The luster is close to BA Use 400# polishing wheel to grind General timber, building timber, kitchen appliances
HL Hairline grinding Suitable particle material for hair stripe grinding (150~240#) with many grains Building, construction material
NO.7 It's close to mirror grinding Use a 600# rotary polishing wheel to grind For art or decoration
NO.8 Mirror ultrafinish The mirror is ground with a polishing wheel Reflector, for decoration

◉ PRODUCTION AND WAREHOUSING

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