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Super austenitic stainless steel

Super austenitic stainless steel with 6% molybdenum provides superior resistance to chloride pitting, interstitial corrosion and stress corrosion cracking。Alloy SSC-6Mo (UNS N08367) is directly comparable to AL6XN®。

Available thicknesses for Alloy SSC-6MO:

3/16" 1/4" 5/16" 3/8" 1/2" 5/8"
4.8mm 6.3mm 7.9mm 9.5mm 12.7mm 15.9mm
 
3/4" 1" 1 1/4" 1 1/2" 1 3/4" 2"
19mm 25.4mm 31.8mm 38.1mm 44.5mm 50.8mm

General attributes

Ssc-6mo (UNS N08367) is a super austenite containing 6% molybdenum and has superior corrosion resistance to chloride pitting, interstitial corrosion and stress corrosion cracking compared to standard 300 series and duplex stainless steels。Ssc-6mo is a cost-effective alternative to expensive nickel alloys in applications requiring excellent corrosion resistance, strength, ease of machining and welding。It was named SSC-6MO (UNS N08367), equivalent to the alloy AL6XN®

High nickel (24%) and high molybdenum (6.The composition of SSC-6Mo is beneficial to stress corrosion cracking of chloride, while the composition of molybdenum is resistant to chloride pitting。High levels of chromium (21%) and nitrogen (0.22%) contribute to the alloy's superior corrosion resistance。

Because of the high nitrogen content, SSC-6Mo has stronger tensile properties than ordinary austenitic stainless steel。The ASME design stress margin of SSC-6Mo is 70% higher than that of 316L and more than twice as high as that of cu-Ni alloy。

The flexibility and ductility of SSC-6Mo make it easy to process。Compared to other super duplex stainless steels and more corrosion resistant ferritic stainless steels, SSC-6Mo is easier to weld and form。


应用

  • Air pollution control
  •       Flue gas desulfurization system for coal-fired power plant
  • Chemical treatment plant
  • Food and beverage processing equipment
  • 煤矿
          Coal mining sewage treatment
          Gold mining pollution control equipment
  • Offshore oil and gas production facilities
  •        Seawater filtration, heat exchanger, piping system
  • Petroleum refining plant
  • Pharmaceutical and bioengineering
  •       Processing equipment and piping system
  • Electricity generation
  •       Condenser, pump, feed water heater, piping system
  • Paper and pulp industry
  •       Chlorine dioxide bleaching device
  • Water treatment
  •       Desalination equipment

Conform to the standard

ASTM........A 240, B 688
ASME........SA 240, SB 688

Design stress allowance

One of the advantages of high nitrogen stainless steels such as SSC-6Mo and duplex stainless steels is that they have higher strength grades than ordinary austenitic stainless steels。High strength grades, combined with sSC-6Mo corrosion resistance give the building structure a thinner cross section。The STRESS level of SSC-6Mo is 66% higher than that of 316L at 200°F and maintains its strength at high temperatures。Ssc-6mo is easy to process in cases where austenitic stainless steel is required for standard machining。

Chemical analysis

Typical Analysis (weight %)

20.6 0.02
24.3 0.001
0.01 0.3
0.4 Remainder *
6.3 0.21
0.25

*Alloy elements make up the majority of the Alloy elements and only a small amount of other elements。.

 

Physical properties of

密度

0.290 pounds per inch3
8.02 grams per centimeter3

permeability

1.003 Oster (Uranium at 200H)

Thermal conductivity 212°F (100°C)

6.8 Bt. -inch/hour -inch2/°F (68-212°F)
11.8 w/m - degree (20 -- 100°C)

Linear coefficient of thermal expansion

8.9 10-6/°F (68-212°F)
15.3 10-6/°C (20-100°C)

 

比热

0.11 Bt. / lb. -°F
500 joules per kilogram °K

The resistance coefficient of

535 Ohm circ mil/ft
0.89 u cm

熔距

2470 – 2560°F
1354 – 1404°C

Modulus of elasticity

28.3 psi x 10.6 (75°C)
195 MPa (24 ° C)

Mechanical properties

Typical room temperature mechanical properties have been annealed in steel mills
Plate performance

0.2% residual deformation
The yield strength
Ultimate tensile
强度
elongation
At 2 inches %
(50mm)
面积
shrinkage
硬度
Rockwell hardness B
psi (min.) (MPa) psi (min.) (MPa)
55,000 380 107,000 738 48 60 90

Corrosion performance

The most common reason for corrosion of stainless steel is local chloride corrosion, especially pitting corrosion, gap corrosion and stress corrosion cracking。Ssc-6mo is an upgraded version of austenitic stainless steels such as 316L, 317L and 904L。The corrosion resistance of SSC-6Mo is superior to alloy 20 and alloy 825 in most corrosive environments。In many applications, SSC-6Mo is considered a cheap alternative to more expensive nickel alloys such as G alloy, 625 alloy, 276 alloy and titanium。

Chloride pitting resistance

The pitting resistance of austenitic stainless steel is directly related to its composition, because chromium, molybdenum and nitrogen all occupy a certain proportion。The pitting resistance value (PREN) is used to measure the corrosion resistance of an alloy - the higher the PREN value, the better the pitting resistance.

PREN = % chromium + 3.3钼 + 30氮

The following table shows the PREN values of several alloys:

Composition table

Clearance corrosion resistance

The high molybdenum and nitrogen content of SSC-6Mo is beneficial in chlorine, oxidation and acid solutions, and it is more resistant to gap corrosion in seawater than 316L, 2205 and 904L。

Critical gap erosion temperature test (CCCT) is usually used to compare the resistance of different alloys to gap corrosion。

The temperature at which interstitial corrosion begins in 10% ferric chloride solution

合金 Critical gap corrosion
Temperature ° c.
Temperature, ° C
316L 27 -2
合金 825 27 -2
317L 35 2
317LMN 68 20
2205 68 20
904L 68 20
Alloy G 86 30
SSC-6Mo 95 35

Stress corrosion cracking resistance

Chloride stress corrosion is one of the most serious local corrosion. High temperature and low PH value will increase the possibility of chloride stress corrosion。The results show that the chloride stress corrosion cracking resistance of the alloy will be improved if the nickel content is increased above 12% and the molybdenum content is increased above 3%。The performance of SSC-6Mo is superior to ordinary 300 series stainless steels and some super duplex stainless steels。Up to 250°F (121°C), THE SSC-6Mo is extremely resistant to chloride stress corrosion。When the content of chloride decreases, the critical temperature of chloride stress corrosion cracking increases correspondingly。Caution should be exercised when using SSC-6MO at temperatures above 250°F (121°C)。

General corrosion

Ssc-6mo performs well in the presence of acetic acid, formic acid, phosphoric acid and sodium bisulfate。It can also be used in oxalic acid, sodium hydroxide and amino acids, but not in solutions containing 10% sulfuric acid。In solution boiling test, the overall corrosion resistance of SSC-6Mo is better than 316L and 317L, and comparable to 904L and C276。

For austenitic stainless steels, SSC-6Mo has good corrosion resistance in all forms including dilute sulfuric acid at boiling point (concentration less than 15%) and concentrated sulfuric acid at low temperatures (concentration more than 85%)。In pure sulfuric acid, THE corrosion resistance of SSC-6Mo is better than that of 316L and slightly better than that of 904L。The corrosion resistance of SSC-6Mo is comparable to that of more expensive nickel alloys such as 20 and 825。

The excellent corrosion resistance of SSC-6Mo is required in the processing of phosphoric acid containing halide impurities. Ssc-6mo can also be used in concentrated phosphoric acid (up to 45%) in common purpose alloys 20 and 825。

AL6XN® is a registered trademark of Allegheny Ludlum For use in environments where temperatures are likely to exceed 250°F (121°C)。

Note: The technical data and information provided herein represent the best knowledge available to us, but may change slightly as we study the corrosion level project。 We recommend that you check with us again when you make an inquiry or place an order。 In addition, each product has some special circumstances when it is used。The data provided herein are only descriptions of the products, and these data and information are subject to official written confirmation made by our company。

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