Manufactures & Suppliers of Pipes, Tubes, Flanges, Pipe Fitting & Fasteners

One of the primary reasons behind the increasing popularity of alloy steel is its superior performance compared to carbon steel. The Alloy Steel Pipe offers better corrosion resistance than carbon steel pipes, though it does not match the corrosion resistance levels of stainless steel pipes. However, Alloy Steel Pipes are more affordable than stainless steel pipes, making them an ideal choice for applications that require moderate corrosion resistance at an economical price point. The Alloy Steel Seamless Pipe is particularly recognized for its durability, with the potential to last a lifetime. The Alloy Steel Welded Pipe is also highly valued for its robustness and cost-efficiency.

Alloy Steel Pipe, Alloy Steel Seamless Pipe, Alloy Steel Welded Pipe, Alloy Steel ERW Pipe, Schedule 40 Low Alloy Welded Pipe, ANSI B36.10 Alloy Steel ERW Pipe, MSL/ Jindal Alloy Steel Pipe, ASTM A335 Boiler pipes & Schedule 40 Low Alloy Steel Seamless Pipe, ASME SA 335 Drill Pipe for boilers and High Temperature applications

There are two main types of ASTM A335 Pipe material: high alloy and low alloy. High alloy pipes have an alloying content ranging from 5% to 50%, while low alloy pipes contain less than 5% alloying elements. For instance, the alloying content in Seamless Alloy Steel Pipes is typically around 20% higher than in their welded counterparts, which is why seamless pipes are preferred for high-pressure environments, despite their higher cost. It’s also important to note that the risk of intergranular corrosion is greater in the heat-affected weld zones of welded pipes. Although a visible seam distinguishes Alloy Steel Welded Pipes from seamless ones, modern technology allows for seam reduction treatments in Alloy Steel ERW Pipes, making the seams nearly invisible to the naked eye.


The performance of an alloy steel product surpasses that of carbon steel, offering enhanced durability and corrosion resistance. Although they are priced lower than stainless steel, their corrosion resistance is superior to carbon steel but falls below stainless steel levels.


Alloy Steel Pipe Specifications

Material Alloy Steel Pipe (With IBR Certificate)
Piping Material ASTM A335/ SA 335
Forged/ Bored Pipe A369/ SA369
Alloy Steel Seamless Pipe (OD) 21.3 - 660mm ( Inch 1/2” – 26”)
ASTM A335 SAW 16" - 100" NB
Low Alloy Steel ERW and HFW 1/2” NB – 24” NB
Chromoly Alloy Steel LSAW / DSAW 16’OD TO 54" OD (8 MM TO 50 MM THK)
Wall Thickness of Alloy Steel Pipe 4.5mm to 60mm
Low Alloy Pipe end

TBE -Treaded Both Ends, TOE -Treaded One End, BSE -Bevel small end, PBE -Plain Both Ends, BOE-Beveled One End, BLE -Bevel large end, POE -Plain One End, BBE -Bevel both ends, BE -Beveled end

ASME SA 335 Pipe Length Custom Length, DRL, 6000mm, 20FT, 12000mm, 40FT, Single Random Length (SRL), SRL, 2000mm, Double Random Length (DRL), 3000mm
AS Pipe Wall Thickness SCH-10, SCH-40, SCH-10S, SCH-XS, SCH-40S, SCH-80, SCH-XXS, SCH-5, SCH-80S, SCH-STD, SCH160, SCH-5S
Surface Treatment of Ferritic Alloy Steel Pipe
  • Alloy Steel Galvanized Pipe
  • ASTM A335 material with PVC, Black and color coating
  • Low Alloy Steel Pipe with Transparent oil, anti-rust oil
  • Chromoly Alloy Steel Bare pipe, Painted,
  • 3PE, FBE, Epoxy Coating Low Alloy Pipe
  • or as per clients requirement
Marking by Alloy Steel Pipe suppliers
  • Specification of Alloy Steel Pipe
  • Material Grade
  • Nominal Pipe Sizes (NPS)
  • Wall Thickness or Schedule No.
  • Manufacturing Process (Alloy Steel Seamless/ EFW/ ERW/ Welded)
  • Heat Number
  • Stockholder/ Dealer/ Supplier or Manufacturer’s Name or Custom Logo - as required

Different methods used by Alloy Steel Pipe manufacturers'

Welded, Fabricated, 100% X Ray/ Gamma Ray Welded, Submerged Arc Welded (SAW), Longitudinally Submerged Arc Welded (LSAW), CDW, Horizontal Submerged Arc Welded (HSAW), Electro Fusion Seam Welded (EFSW), Seamless, Electric Resistance Welded (ERW), Cold Drawn Seamless (CDS), Hot Finish Seamless (HFS), Extrusion
Approvals EIL, NORSOK M-650, ONGC, KNPC, BP, ISO 17025 for Laboratories, Merkblatt W0, PED, HAF 604, Shell, Saudi Aramco, IBR, L&T, AD2000, PED 97/23/EC
Origin of ASTM A335 Pipe material Indian, Korean, USA, Russian, American, Africa, Japanese, Gulf, Ukraine, Latin-American, European, Japan, Chinese, Asian, UK
Certificate NACE, HIC, Sour-Service, IBR, EN-10204:3.2, EN-10204:3.1, SSC
Equivalent Standards GOST, AWWA, SAE, ISO, ASTM, GB, DIN, BS, IS, API, JIS, AISI, CSA, NFA, KS, EN, UNI, SS, ANSI
Test

Tensile, Charpy V Impact Test, Eddy current, Flux Leakage examination or Magnetic Flaw detection, Chemical, H2 SERVICE, Non Destructive Testing , Stress , HIC- Hydrogen-induced Cracking, Surface Roughness Test, Ultrasonic, Creep, Macro, TM0177, Impact, IBR, Metallurgical & Stereo Microscopy, Hardness, Straightness, Hardness Test, Ultrasonic Test, Burst Test, NACE MR0175, Positive Material Identification (PMI), Fine Grain, Bend TestBend test / Guided Bend, TM0284, Radiography, SSC- Sulfide Stress Corrosion Cracking, Hydro test, Ferrite, Salt Spray Test to test Phosphating, Micro, Mechanical, Charpy V-Notch Test, IGC- Intergranular Corrosion Test

Additional Services and Facility Polishing, Cutting, Tapping, Threading, Laser/ Water Jet Cutting, Beveling, Sawing
Material Test Certificate (MTC) provided by Alloy Steel Pipe suppliers

EIL, PED, ISO 14001:2015, IBR, Ultrasonic Testing (UT), NDE, Radiographic Testing (RT), ISO 9001:2005, EN 10204 3.1

Supplier of Alloy Steel Pipe in various shapes Square, Hollow, Oval, Rhomboid, Elliptical, Semi-Rhomboid, Round, Rectangle Hollow, Semi-oval, Semi-Round, Triangle
Coated Alloy Steel Pipe suppliers in India PE Coated, Clad Material, Concrete weight coating (CWC), Primer, Anti-Corrosion Paint, UV Dual Layer Coating, Fusion Bonded Epoxy Coating, Dual Layer ARO Coating, Galvanizing, Internal and External Expoxy Coated, Mild Steel Rubber lining (MSRL), LPE Coating And Lining, Black Paint, 3LPP Coated (Three Layer Polyethylene Coating), FBE Coated Pipes, Temporary Corrosion Protection, Coal tar enamel (CTE), Dual Layer FEB, Varnish, Black Japan, FBE Lining
Leading Alloy Steel Pipe manufacturers/ make Sumitomo Corporation, Maharshtra Seamless Limited (MSL), Indian Seamless Metal (ISMT), Benteler, Jindal Saw Limited (JSL), JFE, TATA Steel, United Seamless Tubulaar Pvt. Ltd (USTPL), Interpipe, , Boly Pipe, TMK Arcelormittal
Alloy Steel Material Cutting Techniques Sawing, Laser, Burrless Cuts, Water-Jet, Tapping

An Alloy Steel Pipe is ideal for applications requiring moderate corrosion resistance and high durability at a reasonable cost. In simpler terms, these pipes are used where carbon steel pipes may fail. Alloy steel pipes are classified into low alloy and high alloy steels. Low alloy pipes have an alloying content below 5%, while high alloy steel pipes range from 5% to 50% in alloying content. Like most alloys, the working pressure capacity of Alloy Steel Seamless Pipes is approximately 20% higher than welded pipes. Therefore, for applications demanding higher working pressure, the use of seamless pipes is justified, though they tend to be more expensive. Additionally, the risk of intergranular corrosion in the heat-affected weld zone is more prevalent in welded pipes. While welded pipes can be identified by a latitudinal seam along their length, advancements in technology have enabled surface treatments for Alloy Steel ERW Pipes, reducing the visibility of seams to the human eye.


At Natron Steel, we are committed to providing our clients with top-quality alloy steel pipes that deliver strength, durability, and reliability for various industrial applications.

Alloy Steel Chemical Composition

Alloy Steel C Cr Mn Mo P S Si
0.05 – 0.15 1.00 – 1.50 0.30 – 0.60 0.44 – 0.65 0.025 max 0.025 max 0.50 – 1.00

Mechanical Properties of Alloy Steel

Tensile Strength, MPa Yield Strength, MPa Elongation, %
415 min 205 min 30 min

Alloy Steel Custom Pipes Wall Thickness Chart

STM A450 Hot rolled Outside Diameter, mm Tolerance, %
OD≤101.6, WT≤2.4 +40/-0
OD≤101.6, 2.4<WT≤3.8 +35/-0
OD≤101.6, 3.8<WT≤4.6 +33/-0
OD≤101.6, WT>4.6 +28/-0
OD>101.6, 2.4<WT≤3.8 +35/-0
OD>101.6, 3.8<WT≤4.6 +33/-0
OD>101.6, WT>4.6 +28/-0
Cold Drawn Outside Diameter, mm Tolerance, %
OD≤38.1 +20/-0
OD>38.1 +22/-0
ASTM A530 NPS Outside Diameter, inch Tolerance, %
1/8≤OD≤2-1/2 +20.0/-12.5
3≤OD≤18, WT/OD≤5% +22.5/-12.5
3≤OD≤18, WT/OD>5% +15.0/-12.5
OD≥20, WT/OD≤5% +22.5/-12.5
OD≥20, WT/OD>5% +15.0/-12.5
Alloy Steel Grades Pipes Heat Treatment Chart

 

P5, P9, P11, and P22

 

 

Grade

Heat Treatment Type

Normalizing Temperature Range F [C]

Subcritical Annealing 
or Tempering 
Temperature Range F 

[C]

P5 (b,c)

Full or Isothermal Anneal

 

 

 

Normalize and Temper

*****

1250 [675]

 

Subcritical Anneal (P5c only)

*****

1325 - 1375 [715 - 745]

P9

Full or Isothermal Anneal

 

 

 

Normalize and Temper

*****

1250 [675]

P11

Full or Isothermal Anneal

 

 

 

Normalize and Temper

*****

1200 [650]

P22

Full or Isothermal Anneal

 

 

 

Normalize and Temper

*****

1250 [675]

P91

Normalize and Temper

1900-1975 [1040 - 1080]

1350-1470 [730 - 800]

 

Quench and Temper

1900-1975 [1040 - 1080]

1350-1470 [730 - 800]

Available Stock of Alloy Steel Pipes
Schedule 40 ASTM A335 Seamless Pipe Alloy Steel CDW Pipe
1IN NB Chromoly Alloy Steel Pipe SCH 80 Low Alloy Steel SMLS Pipe
ASME SA 335 High pressure Pipe 8" 29mm Low Alloy Material
Ferritic Alloy Steel 10" Sch 160 Pipe IBR Alloy Steel Thick Wall Seamless Pipe
Welded Chromium Alloy Steel Cold Drawn Pipe High Alloy Steel Schedule 40 Pipe
Alloy Steel Welded Pipe 12" Sch 140 Seamless ASTM A335 Pipe
Low Alloy Steel EFW Pipe Chromoly Alloy Steel ERW Pipe
Low Alloy Boiler Pipe ASME SA 335 12" 37mm WT Pipe
12" sch 100 Ferritic Alloy Steel Seamless Pipe IBR Alloy Steel Sch 80 Pipe
Chromium Alloy Steel Hot Dip Galvanized Pipe ASME B36.10 High Alloy Steel Bevelled SMLS Pipe
Cold Drawn Alloy Steel Seamless Pipe 12" SCH. STD ASTM A335 Pipe SMLS BE
Europe/ Japan/ USA make Low Alloy Steel Pipe Chromoly Alloy Steel Pipe, SCH 160, PL END
Low Alloy Seam Welded Pipe SCH XS ASME SA 335 Pipe
Saudi Aramco Approved Ferritic Alloy Steel Pipe IBR Alloy Steel Lined Pipe
SCHED 20 Chromium Alloy Steel Boiler Seamless Pipes Thick Wall High Alloy Steel Pipe
High Temperature Alloy Steel Pipe ASME B36.10M 26” ASTM A335 Seamless Pipe, BE END
Low Alloy Steel Beveled End PCRMO ipe Chromoly Alloy Steel Sch. 80 200 DN 36 Pipe
Low Alloy Fabricated Pipe ASME SA 335 Round Pipe
Ferritic Alloy Steel Chrome Moly Pipe IBR Alloy Steel Epoxy Lined Pipe