AUSTENITIC STAINLESS 1.4550/1.4971 – 347/347H – S34700/S34709
Available from stock !
UR™ 347 is an austenitic stainless steel with a stabilizing niobium/columbium addition.
The properties of UR™ 347 are :
• Good general corrosion resistance
• Excellent resistance to intergranular corrosion in the as - welded condition
• Easy to weld and form
• Good low temperature toughness
This grade is austenitic in the solution annealed condition (1000 - 1100°C / 1832 - 2012°F) and rapid cooling by air or water.
It contains a small amount of ferrite and niobium/columbium carbonitrides.
347H also available upon request.
PROPERTIES :
STANDARD
> EURONORM : |
EN 1.4550 |
X6 Cr Nin Nb 18-10 |
> ASTM : |
A240 - TP 347 |
UNS S34700 |
CHEMICAL ANALYSIS - WEIGHT %
Typical values
The creep resistant version of the grade (347H) is also available on request, with higher carbon content (0.04-0.10).
CORROSION RESISTANCE :
UR™ 347 is corrosion resistant in :
• Nitric solution, up to 55% weight, up to 80°C (176°F)
• Most of diluted organic acids at moderate temperatures
• Most of food and pharmaceutical products
• Pure phosphoric acid
- whatever concentration in cold solution
- up to 10% diluted hot solution
• Sulphuric or fluoridric acid traces increase the corrosion
• Caustic solutions free of chlorides or fluorides at medium temperatures.
It has only limited corrosion resistance in chloride containing solutions, even diluted, and in sulphuric acid media.
APPLICATIONS :
• High temperature gaskets
• Rocket engine parts
• Expansion joints
• Aircraft collector rings
• Exhaust manifolds
• Chemical production equipment
• Pollution control equipment