Low Alloy Steels

Oil and Gas tools used in the most extreme environments found globally must be able to withstand the most hostile and highly pressurized sour well conditions.

Howco fully understands that in Downhole, Sub Sea, and Wellhead applications, oil tool design emphasis is on safety, dependability and reliability.

Alloys such as 9Cr, 4140 and F22 have been designed to withstand these harsh environments

Howco's extensive Tube and Bar inventories are available to meet the most stringent QA and QC requirements.

For specialist Alloy Steels contact Howco.

Primarily manufactured in:

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

 

AISI 4340

Low alloy 4340: ASTM A29 (VO1.05)

General scope

AISI 4340 is a low alloy steel containing nominally 0.4% C, 0.8% Cr, 0.25% Mo and 1.8% Ni. Higher strength levels up to 150 KSI 0.2% PS may be achieved by suitable heat treatment. Often used in preference to AISI 4140 at the higher strength levels because of its better hardenability and improved CVN impact toughness.

Due to availability this grade is often substituted with European based standards 817M40, EN24 and 1.6528 34CrNiMo6; which are similar but have a slightly lower nominal nickel content of 1.5% and higher nominal chromium content of 1.3%.

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

C Si Mn P S Cr Ni Mo Fe
Min 0.38 0.15 0.60 0.70 1.65 0.20 0.00
Max 0.43 0.35 0.80 0.035 0.040 0.90 2.00 0.30 0.00

Mechanical properties

Condition: Hardened and Tempered

The grade is not approved to NACE MR0175: the nickel content exceeds the 1% max limit specified in NACE MR1075.
U.T.S 150 KSI Min (1035 N/mm2)
0.2% Proof Stress 130 KSI Min (896 N/mm2)
Elongation 13 %
Red of Area 40 %
Size range: 3”∅ - 26”∅

Primarily manufactured in:

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

F22

UNS K21590: ASTM A182 (VO1.01)

General scope

Grade F22 is a low alloy steel containing nominally 2.25% Chromium. The alloy is widely used in the oil patch wellhead applications for connectors, hangers and block valves. Hardness levels up to 22 HRC are approved to NACE MR0175. The grade is often used as the base metal for clad components.

If supplied to ASTM A182 in the normalised and tempered condition, the 0.2% Proof Stress minimum is 30 KSI.

Chemical composition

C Si Mn P S Cr Mo Fe
Min 0.05 0.30 2.00 0.87 0.00
Max 0.15 0.50 0.60 0.040 0.040 2.50 1.13 0.00

Mechanical properties

Condition: Normalised, Hardened and Tempered to 75 KSI

U.T.S 95 KSI Min (655 N/mm2)
0.2% Proof Stress 75 KSI Min (517 N/mm2)
Elongation 18 %
Red of Area 35 %

Condition: Normalised, Hardened and Tempered to 105 KSI

NACE MR0175 limits the supply hardness to 22HRC max.
U.T.S 125 KSI Min (862 N/mm2)
0.2% Proof Stress 105 KSI Min (724 N/mm2)
Elongation 15 %
Red of Area 30 %
Size range: 2”∅ - 36”∅

Primarily manufactured in:

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

9 Cr/1 Mo

UNS S50400: ASTM A182 (VO1.01)

General scope

A martensitic steel containing 9% Chromium and 1% Molybdenum is most commonly used in the hardened and tempered condition. When produced as bar stock it is manufactured to the analysis requirements of ASTM A200 (V01.01).

Though often referred to as a stainless steel the grade does not meet the accepted criteria to be considered a stainless steel.

Used extensively as tubulars, structural and pressure containing members.

This alloy may be subject to accelerated local corrosion in environments containing free oxygen.

Chemical composition

C Si Mn P S Cr Mo Fe
Min 0.25 0.30 8.00 0.90 0.00
Max 0.15 1.00 0.60 0.025 0.025 10.00 1.10 0.00

Mechanical properties

Condition:

NACE MR0175 limits the supply hardness to 22HRC max.
U.T.S 95 KSI Min (655 N/mm2)
0.2% Proof Stress 80 KSI Min (551 N/mm2)
Elongation 20 %
Red of Area 40 %
Size range: 2”∅ - 10”∅

Primarily manufactured in:

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

AISI 4330v

Low alloy 4330v: ASTM A29 (VO1.05)

General scope

AISI 4330v is a low alloy steel containing nominally 0.4% C, 0.8% Cr, 0.25% Mo and 1.8% Ni. Higher strength levels up to 150 KSI 0.2% PS may be achieved by suitable heat treatment. Often used in preference to AISI 4140 at the higher strength levels because of its better hardenability and improved CVN impact toughness

Due to availability this grade is often substituted with European based standards 817M40, EN24 and 1.6528 34CrNiMo6; which are similar but have a slightly lower nominal nickel content of 1.5% and higher nominal chromium content of 1.3%.

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

C Si Mn P S Cr Ni Mo Fe
Min 0.38 0.15 0.60 1.65 0.70 0.20 0.00
Max 0.43 0.35 0.80 0.035 0.040 2.00 0.90 0.30 0.00

Mechanical properties

Condition: Hardened and Tempered

The grade is not approved to NACE MR0175: the nickel content exceeds the 1% max limit specified in NACE MR1075.
U.T.S 150 KSI Min (1034 N/mm2)
0.2% Proof Stress 130 KSI Min (896 N/mm2)
Elongation 13 %
Red of Area 40 %
Size range: 6”∅ - 28”∅

Primarily manufactured in:

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