Fenicro®926/ Alloy 926

GENERAL INFORMATION

Fenicro®926 is an austenitic, special stainless steel that was developed by Wutmarc company. Due to higher molybdenum and nitrogen concentration in alloy Fenicro®926, it was received material with better properties. In particular, Fenicro®926 has as considerable bigger resistance to local corrosion in halide environment, and excellent mechanical properties.

Special characteristics of alloy Fenicro® 926:

- very good resistance against pitting and crevice corrosion in halide environments and environments containing H2S,

- increased resistance against corrosion of cracking in comparison with other austenitic corrosion-proof alloys,

- excellent anticorrosive properties in oxidizing and recovery environments,

- more improved mechanical properties, than at Fenicro® 904L - Alloy 904L,

- improved metallurgical stability in comparison with similar steels with content of nickel 18%,

it is allowed to use for cameras of high pressure in case of work temperatures from -196°С to 400°С

Corrosion resistance

Fenicro® 926 much repeating the chemical composition of Fenicro® 904L but with bigger content of nitrogen up to 0,2 % and bigger content of molybdenum up to 6,5%. Pic. 1 shows the critical temperature of pitting corrosion in the test with ferriferous chloride depending on the sum of reagents, at the same time Fenicro® 926 distinctly shows high rates. At the same time resistance to provoked by pitting corrosion of corrosion of cracking increases.

Content of nickel and nitrogen increases austenitic stability and reduces a tendency to formation of intermetallic phases during hot processing by pressure, a welding (in comparison with the alloys having lower content of these elements)

Content of nickel at the level of 25% together with magnificent resistance to local corrosion allocates Fenicro® 926 alloy with high resistance to corrosion cracking under loading and influence of ions of chlorine.

Long tests of alloy in various calcareous mixes, with the content of chlorine from 10000 to 70000 per milles and the established levels рН and temperatures at the level of 5-6 and 50-68°C respectively for 1 and 2 years of operation have shown that alloy has excellent corrosion resistance against pitting and crevice corrosion.

Fenicro® 926 is characterized by magnificent resistance to many chemical environments, such as sulfuric and phosphoric acid even at the raised temperatures and concentration which are polluted by chlorides and also for salt concentrated and crystallized environments where material shows the increased wear resistance. In view of its good anticorrosive stability in sea water Fenicro® 926 is applied also in constructions of platforms strengthening the coastline. Corrosion resistance of this alloy in easily aerated technical sulfuric acid is presented on Pic.3. The graph shows that Fenicro® 926 has good corrosion resistance (<0,1 mm/a) in easily aerated technical sulfuric acid concentration up to 60% and at a temperature up to 80°С (176°F).

Moreover, Fenicro® 926 is specified in the 6th section of Your List ("Requirements to tanks for transportation of dangerous cargo") which is issued by German Federal Institute for Materials Research and Testing (BAM) in Berlin.

Optimum indicators of resistance to corrosion are reached only on condition of purity of the material offered for application and also correctness of its metallurgical structure

 

Grades and standards

 

Country

Standard

Material description

Chemical composition

Germany

DIN EN

1.4529

X1NiCrMoCuN25-20-7

10088-7

10088-1

VdTÜV

502

France

AFNOR

X1NiCrMoCuN25-20-7

10088-1

UK

BS

X1NiCrMoCuN25-20-7

10088-1

USA

ASTM

ASTE

Code

Case

NACE

 

 

Typical physical properties at room and high temperatures

Density

8,1 g/cm3

0.293 lbf/in3

Melting range,

1320-1390°C

2400-2530°F

Magnetical inductive capacity at 20°С/68°F

<1.001

Mechanical properties

The following properties at the room and increased temperatures are valid for Fenicro®926, solution-annealed condition. Indicators are valid for longitudinal and cross tests.



Minimal mechanical properties Fenicro® 926

Shape

Yield strength

Yield strength

Tensile strength

Elongation

σ0,2

N/mm2

ksi

σ1,0

N/mm2

ksi

σв

N/mm2

ksi

δ5, %

Sheet and plate

Strip

Rod and bar

295

43

340

49

650

94

35

Wire

290-340

42-49

 

 

620-830

90-120

40

 

Chemical composition (% on weight)

 

Ni

Cr

Fe

C

Mn

Si

Cu

Mo

N

P

S

Min

Max

24.0

26.0

20.0

21.0

rest

 

0.02

 

1.0

 

0.5

0.5

1.5

6.0

7.0

0.15

0.25

0.03

0.01