Mechanical Tubing & OCTG

Meeting the needs of the Oil and Gas Industry's demand for Mechanical tubing and Oil Country Tubular goods remains crucial to meeting the world's growing energy demands.

With its global reach, resources and expertise, Howco is able to provide the specialist alloy, duplex and super duplex tubing for chemical processing, wellhead, downhole and completion applications within the wide range of challenging environments where energy is extracted.

Primarily manufactured in:

  • Dubai, UAE
  • Edmonton, Canada
  • Houston, Texas
  • Sheffield, England
  • Singapore

Grade 13-5-2 (NACE approved)

UNS S41425 : S41426 : S41427

General scope

The proprietory "Super 13 Cr" duplex steels developed by Foroni, Sumitomo and Corus offer enhanced mechanical properties allied to higher corrosion resistance than standard 13 Cr or 420 Mod. grades. The 95 KSI strength level is approved for NACE MR0175 applications. The low carbon content also offers improved weldability compared with standard 13 Cr grades.

This super duplex stainless steel is available in bar and tube form. It is often used for completion equipment.

Its main application is in environments containing CO2, chlorides and low concentrations of H25.

Mechanical properties

Size range: 1”∅ - 14”∅

Primarily manufactured in:

  • Dubai, UAE
  • Edmonton, Canada
  • Houston, Texas
  • Sheffield, England
  • Singapore

Grade 304(L) : 316(L) Tube

UNS TP304 (TP304L) : UNS TP316 (TP316L) : ASTM A312 (VO1.01)

General scope

Both austenitic stainless steel from the 300 series 18/8 family. With the additional Molybdenum in 316 giving slightly superior corrosion properties.

Normally supplied Solution Annealed/Treated although it can be supplied cold worked with higher strength properties. The "L" grade has a reduced carbon level to improve corrosion resistance after welding, and generally is more commonly available.

Chemical composition

304 (L)

'L' grade limits C to 0.035% max.
'L' grade increases Ni to 13% max.
C Si Mn P S Cr Ni Mo Fe
Min 18.00 8.00 0.00
Max 0.08 0.75 2.00 0.040 0.030 20.00 11.00 0.00

316 (L)

'L' grade limits C to 0.035% max.
'L' grade Ni range 10% to 15%
C Si Mn P S Cr Ni Mo Fe
Min 16.00 11.00 2.00 0.00
Max 0.08 0.75 2.00 0.040 0.030 18.00 14.00 3.00 0.00

Mechanical properties

Condition: Solution Annealed

'L' grade reduces values by 5 KSI.
NACE MR0175 limits supply hardness to 22 HRC max.
U.T.S 75 KSI Min (515 N/mm2)
0.2% Proof Stress 30 KSI Min (205 N/mm2)
Elongation 30 %
Red of Area 50 %
CVN Impacts @ -75°C (-100°F) 135 Joules (100 ft-lbf)
Size range: 1/”∅ OD up to 2”∅ OD with wall thickness from 22 swg to ”∅

Primarily manufactured in:

  • Dubai, UAE
  • Edmonton, Canada
  • Houston, Texas
  • Sheffield, England
  • Singapore

Alloy G3 Tube

Trade Name Inconel Alloy G3 (1)

General scope

This is a nickel-chromium-iron alloy with additions of molybdenum and copper. Some of the minor elements are controlled to yield increased resistance to heat-affected zone (HAZ) corrosion and improved weldability. Alloy G-3 has excellent corrosion resistance to oxidising chemicals and atmospheres. It is also resistant to reducing chemicals because of its nickel and copper contents.

Nickel also provides the alloy with exceptional stress-corrosion-cracking resistance in chloride-containing environments. The high molybdenum provides very good resistance to pitting and crevice corrosion. The low carbon helps prevent sensitization, giving the alloy resistance to intergranular corrosion.

Today's exploration for oil and gas leads to a range of highly corrosive environments that, in turn, require a range of corrosion-resistant high nickel content alloys. Alloy G-3 is one of these alloys, providing an excellent combination of mechanical properties and strength. This alloy has been used extensively as OCTG in hot, sour environments.

Chemical composition

C Si Mn P S Cr Mo Cu NbCbTa Ti Al Fe
Min 21.00 6.00 1.50 18.00
Max 0.02 1.00 1.00 0.040 0.030 23.50 8.00 2.50 0.50 1.50 5.00 21.00

Mechanical properties

Condition: Cold Worked

U.T.S 130 KSI Min (896 N/mm2)
0.2% Proof Stress 125 KSI Min (896 N/mm2)
Elongation 13 %
Size range: 3.5”∅ - 7.75”∅

Primarily manufactured in:

  • Dubai, UAE
  • Edmonton, Canada
  • Houston, Texas
  • Sheffield, England
  • Singapore

Grade 4130 : 4140 : 4145 Tube

ASTM A519 (VO1.01)

General scope

Stocked through a wide range of sizes, in either mechanical tube, casing or DOM (drawn over mandrel) product forms.

These grades of low alloy steel containing Chromium and Molybdenum are the most widely used alloy for oil patch applications. Usually supplied in the hardened and tempered condition at 22 HRC max. They also find favour in many applications requiring higher strength levels up to 150 KSI 0.2% PS. The grade is not NACE MR0175 approved in these conditions, and should not be used in environments containing H2S.

The hardenability limitations of this grade (depth to which it will harden / obtain the specified mechanical properties after heat treatment) must always be taken into account when designing and selecting equipment.

Chemical composition

AISI 4130

C Si Mn P S Cr Mo Fe
Min 0.28 0.15 0.40 0.80 0.15 0.00
Max 0.33 0.35 0.60 0.040 0.040 1.10 0.25 0.00

AISI 4140

C Si Mn P S Cr Mo Fe
Min 0.38 0.15 0.75 0.80 0.15 0.00
Max 0.43 0.35 1.00 0.040 0.040 1.10 0.25 0.00

AISI 4145

C Si Mn P S Cr Mo Fe
Min 0.43 0.15 0.75 0.80 0.15 0.00
Max 0.48 0.35 1.00 0.040 0.040 1.10 0.25 0.00

Mechanical properties

Condition: Hardened and Tempered to 22 HRC max.

U.T.S 100 KSI Min (689 N/mm2)
0.2% Proof Stress 80 KSI Min (551 N/mm2)
Elongation 20 %
Red of Area 40 %

Condition: Hardened and Tempered to 30-36 HRC

NACE MR0175 limits the supply hardness to 22 HRC max.
U.T.S 130 KSI Min (896 N/mm2)
0.2% Proof Stress 110 KSI Min (758 N/mm2)
Elongation 13 %
Red of Area 30 %
Size range: From ”∅ OD up to 2”∅ OD with wall thickness 0.2”∅ to ”∅

Primarily manufactured in:

  • Dubai, UAE
  • Edmonton, Canada
  • Houston, Texas
  • Sheffield, England
  • Singapore