Carbon Steel Pipes

Reliable Pipes & Tubes Ltd. is one of the biggest carbon steel pipe manufacturer and stockholder in India, with over 250 customers in India and overseas. We are bulk buyers and exporters of carbon steel pipes from factories in India (Jindal, MSL, ISMT) and overseas (China, Japan, Korea, Ukraine, Europe), and are able to give you the best price and quality just in time.

We stock all major grades of carbon steel pipes such as ASME SA 53 Grade B, ASME SA 106 Grade B, ASME SA 333 Grade 6 and API 5L – PSL 1 Gr. A, B, X42, X46, X52, X56, X60, X65, X70. Being one of the largest volume carbon steel pipe supplier, we can guarantee you the lowest prices. At Reliable Pipes & Tubes Ltd., we believe in selling in volume and increasing our customer base across the globe, enabling us to work on low margins. We have an extensive trader network across India and the Middle East, who buy from us on a regular basis.

In addition to traders, we have many EPC contractors, companies and end users in various industries as our customers for carbon steel pipes. Carbon steel pipes are widely used for conveying oil, steam, water, gas, air at low/medium/high pressure or temperature. Additionally these pipes are also used for fire protection systems, civil engineering, architecture and other structures, shipyard, oil field, and gas field.

Production & Stock Range of Carbon Steel Seamless & Welded Pipes

ProductCarbon Steel Pipe
ShapesSquare, Round, Rectangle
TypesSeamless and Welded
Size (NB sizes)1/2″ to 48″
ThicknessSCH 40, SCH 80, SCH 160, SCH XS, SCH XXS, All Schedules
Common GradesAPI 5L Gr. B, ASTM A106 Gr. B, ASTM A333 Gr. 6, ASTM A53 Gr. B, ASTM A500 Gr. B
Fittings TypeSeamless Butt Weld, Flanges, Black, Galvanised Fittings
Other FittingsElbows, Tees, Reducers, Caps, Stub Ends, Flanges (ANSI, Table E, D and H)
Complete Range of Carbon Steel Pipes & Tubes We Have on Sale for You
ASTM A53 Grade A/B Pipe, TubesAPI 5L B, X42 to X8
ASTM A106 Grade A/B/C Pipe, TubesASTM A519: 1010-1045, 4130-4142, 5135
ASTM A179 Tube/ TubingDIN 2391: St30Si, St30A1, St35, St45, St52
ASTM A210 boiler tubeEN 10210: S235JRH; S275J0H, S275J2H; S355J0H, S355J2H; S275NH, S355NH; S275NLH, S355NLH
A333 Grade PipeJIS Specification Pipe & Tube
Carbon Steel Heat Exchanger PipesNACE Certified Carbon Steel Pipes
Carbon Steel Boiler TubesCarbon Steel Pipe for Sour Service
Carbon Steel Condenser TubesSpiral Welded Carbon Steel Pipes
LSAW Carbon Steel PipesCarbon Steel Seamless Pipes
EN10305: E235, E355EN 10297: E355K2, E470, E420J2, E590K2
  • Reliable Pipes & Tubes Ltd. is one of the biggest carbon steel pipe manufacturer and stockholder in India, with over 250 customers in India and overseas. We are bulk buyers and exporters of carbon steel pipes from factories in India (Jindal, MSL, ISMT) and overseas (China, Japan, Korea, Ukraine, Europe), and are able to give you the best price and quality just in time.
  • We stock all major grades of carbon steel pipes such as ASME SA 53 Grade B, ASME SA 106 Grade B, ASME SA 333 Grade 6 and API 5L – PSL 1 Gr. A, B, X42, X46, X52, X56, X60, X65, X70. Being one of the largest volume carbon steel pipe supplier, we can guarantee you the lowest prices.
  • At Reliable Pipes & Tubes Ltd., we believe in selling in volume and increasing our customer base across the globe, enabling us to work on low margins. We have an extensive trader network across India and the Middle East, who buy from us on a regular basis. In addition to traders, we have many EPC contractors, companies and end users in various industries as our customers for carbon steel pipes.
  • Carbon steel pipes are widely used for conveying oil, steam, water, gas, air at low/medium/high pressure or temperature. Additionally these pipes are also used for fire protection systems, civil engineering, architecture and other structures, shipyard, oil field, and gas field.

Complete Range of Chemical and Mechanical Properties of Carbon Steel Pipes

Carbon Steel Pipes, as per ASTM/ASME Standards
ASTM A53/ASME SA53 Grade AASTM A53/ASME SA53 Grade BASTM A106/ASME SA106 Grade AASTM A106/ASME SA106 Grade B
ASTM A106/ASME SA106 Grade CASTM A179/ASME SA179ASTM A192/ASME SA192ASTM A210/ASME SA210 Grade A1
ASTM A210/ASME SA210 Grade CASTM A333/ASME SA333 Grade 1ASTM A333/ASME SA333 Grade 6ASTM A519 Grade 1010
ASTM A519 Grade 1020ASTM A519 Grade 1035ASTM A519 Grade 1045DIN 1629 St37.0
DIN 1629 St44.0DIN 1629 St52.0DIN 2391 St35.0DIN 2391 St45.0
DIN 2391 St52.0DIN 17175 St35.8DIN 17175 St45.8EN 10216-1 P235TR1
EN 10305-1 E235EN 10305-1 E355  

What are Carbon Steel Pipes? What is the Difference Between Carbon Steel and Stainless Steel Pipes?

Definition of Carbon Steel Pipes Along with its Differences.

Carbon Steel (an alloy of steel and carbon) gets corroded but it is hard — the more carbon content, the harder the steel. Low-carbon steel is strong and tough and can be case-hardened if needed. High-carbon steel can be heat treated to make it a lot harder, however, in this condition it tends to be more brittle and more difficult to work with.

Carbon steel and stainless steel have the same basic ingredients of iron and carbon. Their main difference is alloy content—carbon steel has under 10.5 percent alloy content, while stainless steel must contain 10.5 percent chromium or more. That essential difference is what gives carbon steel and stainless steel their distinct physical characteristics.

Carbon SteelStainless Steel
Vulnerable to rustResistant to rust
BrittleLess Brittle
Wear-resistantLess wear-resistant

Applications of Carbon Steel

Carbon steel is used in boilers, pressure vessels, heat exchangers, piping, and other moderate-temperature service systems in which good strength and ductility are desired. Significant other factors include cost, availability, and the ease of fabrication.

Types Of Carbon Steel

Carbon Steel Pipe can be classified into four categories:
  1. Low carbon steel pipe – Carbon content 0.55-1.05%
  2. Medium carbon steel pipe- Carbon content 0.25-10.6%
  3. High carbon steel pipe- Carbon content 0.9-2.5%
  4. Super High carbon steel pipe- Carbon content 2.5-3.0%

Commonly used Carbon Steel explained below:

1. Low Carbon Steel

  • Plain carbon steels – very low content of alloying elements and small amounts of Mn.
  • Most abundant grade of steel is low carbon steel – greatest quantity produced; least expensive.
  • Not responsive to heat treatment; cold working needed to improve the strength.
  • Good Weldability and machinability.
  • High Strength, Low Alloy (HSLA) steels – alloying elements (like Cu, V, Ni and Mo) up to 10 wt %; have higher strengths and may be heat treated.

2. Medium Carbon Steel

  • Carbon content in the range of 0.3 – 0.6%.
  • Can be heat treated – austenitizing, quenching and then tempering.
  • Most often used in tempered condition – tempered martensite.
  • Medium carbon steels have low hardenability.
  • Addition of Cr, Ni, Mo improves the heat treating capacity.
  • Heat treated alloys are stronger but have lower ductility.
  • Typical applications – Railway wheels and tracks, gears, crankshafts.

3. High Carbon Steel

  • High carbon steels – Carbon content 0.6 – 1.4%.
  • High C content provides high hardness and strength.
  • Hardest and least ductile.
  • Used in hardened and tempered condition.
  • Strong carbide formers like Cr, V, W are added as alloying elements to from carbides of these metals.
  • Used as tool and die steels owing to the high hardness and wear resistance property.

4. Super High Carbon Steel

  • Approximately 1.25–2.0% carbon content.
  • Steels that can be tempered to great hardness.
  • Used for special purposes like (non-industrial-purpose) knives, axles or punches.
  • Most steels with more than 2.5% carbon content are made using powder metallurgy.
Wide Range of Steel Grades in Carbon Steel Pipes!
All our carbon steel steel pipe products comply with major ASTM & Indian standards and classifications. The various quality standards according to which we can manufacture and supply carbon and alloy steel steel pipes are as below:
  • ASTM A106 Seamless Carbon Steel Pipes for oil pipeline and gas pipeline transportation – ASTM A106 Grade B
  • API 5L Standard Specification for Seamless Line Pipe or Seamless Pipe Line – API 5L Grade A, Grade B, X42, X46, X52, X56, X60, X65, X70, X80
  • ASTM A 53 Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless – ASTM A 53 Grade A, Grade B, Grade C, Type F, Type E
  • ASTM A519 Seamless Carbon and Alloy Steel Mechanical Tubing – ASTM A519: 1010-1045, 4130, 4140, 4142, 5135
  • DIN 2391 Seamless Precision Steel Tubes- DIN 2391 St30Si, St30A1, St35, St45, St52
  • EN10305 Steel tubes for precision applications. Technical delivery conditions. Seamless cold drawn tubes – EN10305 E235, E355
  • EN 10297 Hot rolled seamless steel tubes with an application in the mechanical and general engineering – EN 10297 E355K2, E470, E420J2, E590K2
  • EN 10210:Seamless structural steel pipes – EN 10210: S235JRH; S275J0H, S275J2H; S355J0H, S355J2H; S275NH, S355NH; S275NLH, S355NLH
What is the Production & Supply Range for Carbon Steel Pipes?
ProductCarbon Steel Pipes
MaterialsCarbon Steel
Outer DiameterHot finish: 2″ – 30″,Cold drawn: 0.875″ – 18″
Wall ThicknessHot finish: 0.250″ – 4.00″,Cold drawn:0.035″ – 0.875″
LengthRandom Length, Fixed Length, SRL, DRL
Heat TreatmentBright Annealed, Normalized, Stress relieved, Cold finished, Quenched and Tempered
PackingPlastic End Caps in Both Ends, Bundled Packing with Steel Strips
Testing & InspectionChemical Analysis, Mechanical Properties (Ultimate tensile strength, Yield
strength, Elongation), Technical Properties (Flattening Test, Flaring Test, Bending Test, Hardness Test, Blow Test, Impact Test)
Test CertificatesAs per EN 10204 3.1B

What are the Manufacturing and Testing Requirements for Carbon Steel Pipes?

Heat TreatmentHot-finished pipe need not be heat treated. Cold-drawn pipe shall be heat treated after the final cold draw pass at a temperature of 1200 °F (650 °C) or higher.
Process

Carbon steel and mild steel are manufactured in three stages:

  1. Primary steelmaking
  2. Secondary steelmaking
  3. Casting
  • The steel shall be killed steel, with the primary melting process being open-hearth, basic-oxygen, or electric-furnace, possibly combined with separate degassing or refining. If secondary melting, using electroslag remelting or vacuum-arc remelting is subsequently employed, the heat shall be defined as all of the ingots remelted from a single primary heat.
  • Steel cast in ingots or strand cast is permissible. When steels of different grades are sequentially strand cast, identification of the resultant transition material is required. The producer shall remove the transition material by any established procedure that positively separates the grades.
Surface TreatmentOil-dip, Varnish, Passivation, Phosphating, Shot Blasting, Hot dip galvanizing, Electrolytic galvanizing
Hydrostatic TestingInspection test pressures produce a stress in the pipe wall equal to 60% of specified minimum yield strength (SMYS) at room temperature. Maximum Pressures are not to exceed 2500 psi for NPS3 and must stay under 2800 psi for the larger sizes. Pressure is maintained for not less than 5 seconds.
Nondestructive Electric TestThe full body of each pipe shall be tested with a nondestructive electric test in accordance with Practice E 213, E 309, or E 570.
Mechanical Tests Specified
  • Tensile Test — NPS 8 and larger — either transverse or longitudinal acceptable smaller than NPS 8 — weighed in lots.
  • Larger sizes — by length.
  • Flattening Test — NPS 2-1/2 and larger.
  • Bending Test (Cold) — NPS 2 and under.
Which is the Most Widely Used Grade in Carbon Steel Pipes?
ASME SA/ASTM A106 Gr. B, also widely referred as API 5L Grade B or ASTM A53 Grade B is the most widely used grade of carbon steel pipes, across the globe. Our maximum stock of carbon steel pipes is in this grade. The properties of ASTM A106 Gr. B pipes is as below:

Chemical Composition of ASTM A106 Carbon Steel Seamless Pipes

ASTM A106 Steel Grade C, max.%Mn %P, maxS, maxSi, minCr, maxCu, maxMo, maxNi, maxV, max
Grade A0.250.27 – 0.930.0350.0350.10.40.40.150.40.08
Grade B0.30.29 – 1.060.0350.0350.10.40.40.150.40.08
Grade C0.350.29 – 1.060.0350.0350.10.40.40.150.40.08

Mechanical Properties of ASTM A106 Carbon Steel Seamless Pipes

ASTM A106 Steel GradeTensile Test MPa or N/mm2
Min. Yield PointTensile Strength
Grade A205330Min
Grade B240415Min
Grade C275485Min

Equivalents of ASTM A106 Seamless Pipes

SpecificationMechanical PropertiesGrade AGrade BGrade C
ASTM A53Tensile strength, min, psi (MPa)48000(330)60000(415) 
Yield strength, min, psi (MPa)30000(205)35000(240) 
ASTM A106Tensile strength, min, psi (MPa)48000(330)60000(415)70000(485)
Yield strength, min, psi (MPa)30000(205)35000(240)40000(275)
Effects of Alloying Elements on Steel

•Manganese – strength and hardness; decreases ductility and weldability; effects hardenability of steel.
•Phosphorus – increases strength and hardness and decreases ductility and notch impact toughness of steel.
•Sulfur decreases ductility and notch impact toughness Weldability decreases. Found in the form of sulfide inclusions.
•Silicon – one of the principal deoxidizers used in steel making. In low-carbon steels, silicon is generally detrimental to surface quality.
•Copper – detrimental to hot-working steels; beneficial to corrosion resistance (Cu>0.20%).
•Nickel – ferrite strengthener; increases the hardenability and impact strength of steels.
•Molybdenum –  increases the hardenability; enhances the creep resistance of low-alloy steels.

Standard and Code Specification of Carbon Steel
Frequently Used ASTM Grades of Carbon Steel
Carbon SteelTypeStandardGradesSpecification
Medium-TempPipesA106A, B, CThis specification covers carbon steel pipe for high-temperature service.
 FittingsA234WPA, WPB, WPCThis specification covers wrought carbon steel and alloy steel fittings of seamless and welded construction.
 FlangesA105 This specification covers standards for forged carbon steel piping components, that is, flanges, fittings, Valves, and similar parts, for use in pressure systems at ambient and higher-temperature service conditions.
 ValvesA216WCBThis specification covers carbon steel castings for Valves, flanges, fittings, or other pressure-containing parts for high-temperature service and of quality suitable for assembly with other castings or wrought-steel parts by fusion welding.
 Bolts & NutsA193B7This specification covers alloy and stainless steel bolting material for pressure vessels, Valves, flanges, and fittings for high temperature or high pressure service, or other special purpose applications.
  A1942HStandard specification for nuts in many different material types.
High-TempPipesA335P1, P11, P12, P22, P5, P9This specification covers seamless ferritic alloy-steel pipe for high-temperature service.
 FittingsA234WP1, WP11, WP12, WP22, WP5, WP9This specification covers wrought carbon steel and alloy steel fittings of seamless and welded construction.
 FlangesA182F1, F11, F12, F22, F5, F9This specification covers forged or rolled alloy and stainless steel pipe flanges, forged fittings, and Valves and parts for high-temperature service.
 ValvesA217WC1, WC6, WC9, C5, C12This specification covers steel castings, martensitic stainless steel and alloys steel castings for Valves, flanges, fittings, and other pressure-containing parts intended primarily for high-temperature and corrosive service.
 Bolts & NutsA193B7This specification covers alloy and stainless steel bolting material for pressure vessels, Valves, flanges, and fittings for high temperature or high pressure service, or other special purpose applications.
  A1942HStandard specification for nuts in many different material types.
Low-TempPipesA3336, 3This specification covers wall seamless and welded carbon and alloy steel pipe intended for use at low temperatures.
 FittingsA420WPL6, WPL3Standard specification for piping fittings of wrought carbon steel and alloy steel for low-temperature service.
 FlangesA182F304, F316, F321, F347This specification covers forged or rolled alloy and stainless steel pipe flanges, forged fittings, and Valves and parts for high-temperature service.
 ValvesA182F304, F316, F321, F347This specification covers forged or rolled alloy and stainless steel pipe flanges, forged fittings, and Valves and parts for high-temperature service.
 Bolts & NutsA193B8This specification covers alloy and stainless steel bolting material for pressure vessels, Valves, flanges, and fittings for high temperature or high pressure service, or other special purpose applications.
  A1948Standard specification for nuts in many different material types.
Heat Processes
The most common heat processes are:

Anneal – provides a soft low strength structure with maximum ductility
Normalize – provides a medium strength and hardness with improved ductility
Quench and Temper – Provides the maximum strength levels with good ductility and wear resistance.

What are the Steel Pipe Sizes?

Steel pipe sizes

Pipe size is quoted as a “Nominal Pipe Size” or NPS. The origin of the NPS numbers for smaller pipes (< NPS 12) is different to the origin for larger diameter pipes. However, all pipes of a specific NPS number have the same external or outer diameter (OD). The internal diameter will vary depending on the wall thickness of the metal. The reason for this is so that the same structural supports can be used for all piping of a specific NPS number regardless of the wall thickness.

Schedules

Steel pipe schedules are a way to describe the wall thickness of the pipe. This is a critical parameter as it is directly related to the strength of the pipe and the suitability for specific applications. A pipe schedule is a dimensionless number and is calculated based on the design formula for wall thickness, given the design pressure and allowable stress.

Examples of schedule numbers are as follows: 5, 5S, 10, 20, 30, 40, 50, 60, 80, 100, 120, 140, 160, STD, XS, and XXS—with the most common being schedules 40 and 80. As the schedule number increases, the wall thickness of the pipe increases. The schedule number of a pipe therefore defines the internal diameter, as the OD is fixed by the NPS number.

Over 10000 Tons in Stock for Carbon Steel Pipes!

ISMT & Jindal Steel Pipes Dealers, Original MTR’s Provided with All Materials

As one of the biggest carbon steel pipe stockholder and supplier in India, Reliable Pipes & Tubes Ltd. carries inventory of over 10,000 tons in its warehouses in Mumbai, Maharashtra India. We sell our carbon steel pipe products throughout India, and to international clients. We can supply our carbon steel tube products not only in industry-standard lengths and diameters, but also in custom length and diameters.

 

How are Steel Pipes Certified?

Certification of Steel Pipes

Manufacturers issue a Material Test Report or Mill Test Report to validate that the product meets the chemical analysis and mechanical properties specification. The MTR will contain all relevant data to the product and will accompany the product through its lifecycle.

The following are typical parameters that may be recorded on an MTR:

  • Chemical composition including carbon content, alloys, and sulfur
  • Material size, weight, identification, and grade
  • Material heat number, which ties back to the processing batch
  • Mechanical properties like tensile strength, yield strength, and elongation