Home | Materials | NITRIC ACID GRADES | 1.4361 – UNS S30600 – X1 Cr Ni Si 18-15-4

1.4361

UNS S30600
X1 Cr Ni Si 18-15-4
F46

Applications :

Mineral chemistry :Production of concentrated HNO3
Organic chemistry :Use of concentrated HNO3 (nitration)
Nuclear industry :Evaporator working in nitric environment, to concentrate products of fusion
Metallurgical industry :Tanks – equipment destined for nitrogen sulphite mixtures
Chemical industry :Chrome sulphite mixtures, very oxyding solutions

A strong addition of silicon to austenitic stainless steels of the 18/10 type has a favourable influence on resistance to transpassive intergranular corrosion. This type of corrosion develops particularly in very concentrated nitric environments (> 90 %) up to boiling point, also in strongly oxydising nitric environments (oxidising ions present such as : hexavalent chromium, pentalivalent vanadium – ferritic salts etc…)1.4361 has a chemical composition adapted to work in the transpassive zone. It resists perfectly to intergranular corrosion.

Mechanical Properties

Tensile strength:	530-730	N/mm²
Yield strength 0,2% :	210	≥ N/mm²
Elongation:	40/30	≥ %
Hardness Brinell:	230	≤ HB

Chemical Composition

Carbon

C

0,015% max

Silicon

Si

3,7-4,5% max

Magnese

Mn

2,00% max

Phosphorus

P

0,025% max

Sulphur

S

0,005% max

Chromium

Cr

16,5-18,5% max

Nickel

Ni

14-16% max

Nitrogen

N

0,035% max

Heat Treatment

1100/1150°C (2010/2100°F) -cooling in water (holding time 1 to 2 min. per mm of plate thickness oxidising environment).

Corrosion Testing
Welding

Corrosion Testing

98% at room temperature /Corrosion rate : Pratically non existent
98% boiling / Corrosionr rate ≤ 0.20mm/year
28% boiling + 1g/l of hexavalent chrome /Corrosion rate : ≤ 0.30mm/year
28% boiling + 1g/l of trivalent chrome / Corrosion rate :≤ 0.30mm/year with no trace of intergranular corrosion

Welding

Welding 1.4361 requires well qualified welders. It is carried out both TIG and MIG processes (recommended technique) with our welding filler metal and under inert gas protection. Arc extingnishess are indispensable to avoid craters. It is also necessary to adapt speed and compatible amperage in order to limit the temperature between passes.

Heat treatment after welding is not necessary. For very severe conditions of use, it could be advisable. However, pickling after welding is necessary and then continue immediately with a passivation treatment.