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{"title":"ASTM A312 S31254 Duplex Stainless Steel Pipes For Heat Exchanger","imgUrl":"https:\/\/img.chinax.com\/nimg\/35\/0b\/dac0c6422c64db377ef70b14d400-200x200-1\/astm_a312_s31254_duplex_stainless_steel_pipes_for_heat_exchanger.jpg","attrs":{"Brand Name":"Shangle","Model Number":"12.7","Certification":"PED,IS09001","Place of Origin":"CHINA"}}
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{"title":"Super Duplex Stainless Steel 2507 ASTM A790 UNS S32750 \/ 1.4410 Seamless Pipes","imgUrl":"https:\/\/img.chinax.com\/nimg\/df\/82\/6a5bc870a87bcb5d5b563d8fe0f3-200x200-1\/super_duplex_stainless_steel_2507_astm_a790_uns_s32750_2f_1_4410_seamless_pipes.jpg","attrs":{"Brand Name":"Shangle","Model Number":"12.7","Certification":"PED,IS09001","Place of Origin":"CHINA"}}
{"title":"ASTM A789 \/ ASME SA789 UNS S31803 \/ 1.4462 DUPLEX STAINLESS STEEL SEAMLESS TUBE","imgUrl":"https:\/\/img.chinax.com\/nimg\/99\/da\/aa0dbde25ce70a4f1a55c403d045-200x200-1\/astm_a789_2f_asme_sa789_uns_s31803_2f_1_4462_duplex_stainless_steel_seamless_tube.jpg","attrs":{"Brand Name":"Shangle","Model Number":"12.7","Certification":"PED,IS09001","Place of Origin":"CHINA"}}
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
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)
Wenzhou Shangle Steel Co., Ltd. (Shangle) founded in 2017, is a comprehensive company integrating industry and trade.
As a leading supplier of stainless steel products in Wenzhou, it has a wide range of products in stock that have been rigorously tested and are ready to be shipped.
... Wenzhou Shangle Steel Co., Ltd. (Shangle) founded in 2017, is a comprehensive company integrating industry and trade.
As a leading supplier of stainless steel products in Wenzhou, it has a wide range of products in stock that have been rigorously tested and are ready to be shipped.
...
