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ASTM A312 Duplex Stainless Steel Tube High Resistance

  • ASTM A312 Duplex Stainless Steel Tube High Resistance
Place of Origin CHINA
Brand Name Shangle
Certification PED,IS09001
Model Number 12.7
Minimum Order Quantity Negotiable
Price Negotiable
Packaging Details Woven Packing
Delivery Time 30DAYS
Payment Terms L/C, T/T
Supply Ability 500TONS/30DAYS

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Product Details
Material S31803/s32205/309S/2520/314/317/347/904/254 Standard AISI, ASTM, DIN, EN, GB
Shape SCH10, SCH20, SCH30, STD, SCH40, SCH60, SCH80 Technique Cold Draw
Application Oil, Petroleum/Power Package Woven Packing
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High Resistance Stainless Steel Tube

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ASTM A312 Duplex Stainless Steel Tube
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Product Description

ASTM A312 S31254 Stainless Steel Seamless Pipe , offshore and platform application

 

254 SMO is a high-alloy austenitic stainless steel developed for use in seawater and other aggressive chloride-bearing media. The steel is characterized by the following properties:

 

  • A.Excellent resistance to pitting and crevice corrosion, PRE = ≥42.5%
  • B.High resistance to general corrosion
  • C.High resistance to stress corrosion cracking
  • D.Higher strength than conventional austenitic stainless steels
  • E.Good weldability

The PRE is defined as, in weight of content %, PRE = Cr % + 3.3 x Mo % + 16 x N %

 

 

Standards

  • UNS: S31254
  • EN Number: 1.4547
  • EN Name: X1CrNiMoCuN20-18-7
  • W.Nr.: 1.4529
  • SS: 2378
  • AFNOR: Z1 CNDU 20.18.06AZ
  • Product standards
  • Seamless tube and pipe: ASTM A269, A213, A312, NFA 49-217, EN 10216-5
  • Norsok MDS R11/R18, IOGP S-563 MDS IR111/111S/IR118/IR118S
  • Welded tube and pipe: ASTM A249, A269 , A312, A358, A409
  • Fittings: ASTM A182
  • Bar: ASTM A276, A479, EN 10088-3
  • Forged products: ASTM A473
Chemical composition (nominal) %
C Si Mn P S Cr Ni Mo N Cu
≤0.020 ≤0.80 ≤1.00 ≤0.030 ≤0.010 20 18 6.1 0.20 0.7

254 SMO Applications:

  • 1. Equipment for handling of seawater, such as, seawater cooling, cooling water pipes, ballast water systems, firefighting systems etc.
  • 2. Hydraulic and instrumention tubing
  • 3. Equipment in pulp bleaching plants
  • 4. Components in gas cleaning systems
  • 5. Tanks and pipelines for chemicals with high halide contents
Stress corrosion cracking tests in boiling 25% NaCl solution, pH=1.5. U-bend specimens.
ASTM TP316
<150 h
Pitting
'904L'
No failure (1000 h)
Crevice corrosion
Sandvik 254 SMO
No failure (1000 h)
No attack
Grade Time to failure hours
Stress corrosion cracking tests. Drop evaporation method*. Stress: 0.9xRp0.2
ASTM TP316
105
TP904L
225
254 SMO
425

Intergranular corrosion

254 SMO has a very low carbon content. This means that there is very little risk of carbide precipitation during heating, for example when welding. The steel passes the Strauss test (ASTM A262, practice E) even after sensitizing for one hour at 600–1000°C (1110–1830°F).

However, due to the high alloying content of the steel, inter-metallic phases can precipitate at the grain boundaries in the temperature range 600–1000°C (1110–1830°F). These precipitations do not involve any risk of intergranular corrosion in the environments in which the steel is intended to be used. Thus, welding can be carried out without any risk of intergranular corrosion.

Pitting corrosion

The pitting and crevice corrosion resistance of stainless steel is primarily determined by the content of chromium, molybdenum and nitrogen. Manufacture and fabrication, e.g. welding, are also of vital importance for the actual performance in service. A parameter for comparing the resistance to pitting in chloride environments is the PRE number (Pitting Resistance Equivalent). The PRE is defined as, in weight-%, PRE = %Cr + 3.3 x %Mo + 16 x %N

Heat Treatment
The tubes are delivered in heat treated condition. If additional heat treatment is needed due to further processing the following is recommended.
Solution annealing 1150–1200°C (2100–2190°F), quenching in water. Thin-walled tubes min. 1130°C (2060°F), quenching in air/water.

Mechanical Properties
 
Wall thickness Proof strength Tensile strength Elong. Hardness
  Rp0.2a) Rp1.0a) Rm Ab) A2" HRB
mm MPa MPa MPa % %  
Metric units, at 20°C
<5 ≥310 ≥340 675-850 ≥35 ≥35 ≤96
>5 ≥310 ≥340 655-850 ≥35 ≥35 ≤96
1 MPa = 1 N/mm2

 

Wall thickness Proof strength Tensile strength Elong. Hardness
  Rp0.2a) Rp1.0a) Rm Ab) A2" HRB
inch ksi ksi ksi % %  
Imperial units, at 68°F
<0.187 ≥45 ≥49 98-123 ≥35 ≥35 ≤96
>0.187 ≥45 ≥49 98-123 ≥35 ≥35 ≤96

a) Rp0.2 and Rp1.0 correspond to 0.2% offset and 1.0% offset yield strength, respectively.
b) Based on L0 = 5.65 √S0 where L0 is the original gauge length and S0 the original cross-section area.

 

Weldding:

Recommended filler metals

TIG/GTAW or MIG/GMAW welding
ISO 18274 S Ni 6625/AWS A5.14 ERNiCrMo-3 (e.g. Exaton Ni60)
ISO 18274 S Ni 6059/AWS A5.14 ERNiCrMo-13 (e.g. Exaton Ni59)

MMA/SMAW welding
ISO 14172 E Ni 6625/AWS A5.11 ENiCrMo-3 (e.g. Exaton Ni60)
ISO 14172 E Ni 6059/AWS A5.11 ENiCrMo-13 (e.g. Exaton Ni59)


ASTM A312 Duplex Stainless Steel Tube High Resistance 0
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