Stainless, Duplex, Super Duplex, Aluminum

Stainless steel and duplex steels play a safety critical role in the oil and gas industries. Modern refineries produce around 100,000 barrels of oil per day, through several processes involving intense heat, corrosive liquids, and toxic gases.

The process uses an intricate series of safety valves and components, where Stainless and Duplex steels are often used for their high corrosion resistance - minimizing downtime and maximizing output.

Howco's extensive range of high integrity Stainless and Duplex steels such as -- 13 Cr and Super 13 Cr precipitation hardening Stainless, and 22 Cr and 25 Cr Duplex grades in both Tubular and Bar products is available from Howco locations worldwide.

For Stainless or Duplex requirements call Howco direct.

Primarily manufactured in:

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

Grade 660 (A-286)

UNS S66286 : ASTM A638 (VO1.03), A453 (VO1.01)
Trade Name A-286

General scope

Grade 660 is a precipitation hardening austenitic stainless steel widely used for high temperature fastening and bolting materials. Its relatively high nickel content for a stainless steel means that is sometimes categorized as a nickel alloy. The grade is commonly used for operating temperatures up to 7007°C (13007°F).

Chemical composition

 

 
 CSiMnPSCrNiMoTiAlVBFe
Min 13.50 24.00 1.00 1.90 0.10 0.00
Max 0.08 1.00 2.00 0.040 0.030 16.00 27.00 1.50 2.35 0.35 0.50 0.01 0.00

Mechanical properties

Condition: Solution Annealed and Water Quenched.

NACE MR0175 limits the supply hardness to 35 HRC max.
U.T.S 130 KSI Min (895 N/mm2)
0.2% Proof Stress 85 KSI Min (585 N/mm2)
Elongation 15 %  
Red of Area 18 %  
CVN Impacts @ -60°C (-75°F) 57 Joules (42 ft-lbf)
Size range: 2”∅ - 12”∅

Primarily manufactured in:

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

Grade S32760 - F55

UNS S32760 : Super Duplex : ASTM A182 (VO1.01), A276 (VO1.03), A479 (VO1.03), BS EN 10088
Trade Name Zeron 100 (4)

General scope

The characteristic features of high strength and corrosion resistance exhibited by the dual microstructure (50% Austenite, 50% Ferrite) associated with Duplex Stainless Steels, are enhanced by a further addition of Chromium (to 25%), and also Tungsten and Copper.

The alloy's pitting and Crevice Corrosion resistance is better than Standard F51 duplex, The pitting index (PREN) is increased to 40 min from standard F51 Duplex value of 33 min.

Thin sections (Tubulars) are capable of being cold worked to give yield strength of 105 KSI min.

To optimise mechanical properties, avoid clinking, and to avoid deleterious intermetallics within the microstructure; special high temp forming and heat treatment control practices must be followed during processing.

Chemical composition

(PREN = % Cr + 3.3% Mo + 16% N)
C Si Mn P S Cr Ni Mo Cu N W PREN Fe
Min 24.00 6.00 3.00 0.50 0.20 0.50 40.00 0.00
Max 0.03 1.00 1.00 0.030 0.010 26.00 8.00 4.00 1.00 0.30 1.00 0.00

Mechanical properties

Condition: Solution Annealed and Water Quenched.

NACE MR0175 limits the supply hardness to 28 HRC max.
U.T.S 109 KSI Min (750 N/mm2)
0.2% Proof Stress 80 KSI Min (550 N/mm2)
Elongation 25 %
Red of Area 45 %
CVN Impacts @ -46°C (-50°F) 45 Joules (33 ft-lbf)
Size range: 1”∅ - 16”∅

Primarily manufactured in:

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

Grade S32550

UNS S32550 : Super Duplex : A276 (VO1.03), A479 (VO1.03)
Trade Name Ferralium Alloy 255 (5)

General scope

The characteristic features of high strength and corrosion resistance exhibited by the dual microstructure (austenite, ferrite) associated with duplex stainless steels are found in UNS S32550. It is similar in composition to the more widely used super duplex grade UNS S32760. UNS S32550 has a slightly higher copper level, lower nickel and no deliberate tungsten additions, and is normally supplied to achieve the UNS S32760 PREN requirement of 40.

Chemical composition

(PREN = % Cr + 3.3% Mo + 16% N)
C Si Mn P S Cr Ni Mo Cu N PREN Fe
Min 24.00 4.50 2.90 1.50 0.10 40.00 0.00
Max 0.04 1.00 1.50 0.040 0.030 27.00 6.50 3.90 2.50 0.25 0.00

Mechanical properties

Condition: Solution Annealed and Water Quenched.

NACE MR0175 limits the supply hardness to 28 HRC max.
U.T.S 110 KSI Min (760 N/mm2)
0.2% Proof Stress 80 KSI Min (550 N/mm2)
Elongation 15 %
CVN Impacts @ -46°C (-50°F) 45 Joules (33 ft-lbf)
Size range: 1”∅ - 12”∅

Primarily manufactured in:

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

Grade S31803 - F51

UNS S31803 : Duplex Stainless : ASTM A182 (VO1.01), A276 (VO1.03), A479 (VO1.03), BS EN 10088
Trade Name Zeron 25 (4)

General scope

The characteristic feature of duplex stainless steels is their dual phase microstructure, comprising of approximately 50% of austenitic and 50% of ferrite. This provides the material with an excellent combination of high strength and corrosion resistance.

Pitting Corrosion - The resistance to pitting corrosion may be compared to other grades by using the pitting index PREN. The higher the PREN value, the better the pitting resistance.

Chemical composition

(PREN = % Cr + 3.3% Mo + 16% N)
C Si Mn P S Cr Ni Mo N PREN Fe
Min 21.00 4.50 2.50 0.08 33.00 0.00
Max 0.03 1.00 2.00 0.030 0.020 23.00 6.50 3.50 0.20 0.00

Mechanical properties

Condition: Solution Annealed and Water Quenched.

NACE MR0175 limits the supply hardness to 28 HRC max.
U.T.S 90 KSI Min (620 N/mm2)
0.2% Proof Stress 65 KSI Min (450 N/mm2)
Elongation 25 %
Red of Area 45 %
CVN Impacts @ -40°C (-40°F) 40 Joules (30 ft-lbf)
Size range: 1”∅ - 18”∅

Primarily manufactured in:

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