UR B66

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This steel is a super austenitic stainless steel with high chromium, molybdenum, nitrogen content, tungsten and copper, and a PRE value of up to 50. This steel was introduced in 1994. Due to the reasonable ratio of chemical composition of this steel, its mechanical properties, corrosion resistance, welding performance and microstructure stability of the steel are at a high level in the 6% Mo type super austenitic stainless steel.

UR B66Chemical composition:

  Cr Ni Mo W Cu N C Si S
\Min 23 21 5.2 1.5 1 0.35
Max 25 24 6.2 2.5 2.5 0.6 0.03 1 0.02

UR B66 Physical properties:

Density 8.4 g/cm³
Melting point 1290-1350°C
Thermal conductivity 13.3 W/(m·K)
Coefficient of thermal expansion 12.8× 10^(-6)/°C

UR B66Mechanical properties:

Product type size/mm Test temperature/℃ σp0.2/MPa σb/MPa δ/% Charpy (V-notch) impact power/J
Hot-rolled plates  

12

12 446 850 60 >300
-50   —— >300
-196   —— >300
 

 

Forged Products (Bars))

 

φ235

300 476 863 80  
20 —— —— >3000
-50 585 1003 80 >300
-196     >3000
4500 20       211
-50 ——   239
P700 20       151
-50       127

UR B66Alloy properties:

The 1150°C solid solution treated matrix of this steel is a single austenite structure and there is no σ, x-equal intermetallic phase, carbon and nitride. HuaNickel Compared to 6% Mo type super austenitic stainless steel, the microstructure stability of this steel can meet the needs of products with thick cross-section sizes (e.g. forgings), even if there is a small amount of σ and x-phase precipitation in the core of a large forging

UR B66Uses of alloys:

It can be used in installations, pipelines, and various structural parts in these media environments.

UR B66Process performance:

Welding process: This steel is weldable and can be welded using welding methods common to austenitic stainless steels such as GTAW, GMAW or SMAW.

Heat treatment: This steel can be heated at about 1150 °C, heat preservation and then fast cooling. For products with large cross-sectional sizes, the cooling rate should be sufficient to avoid the precipitation of intermetallic phases.

Relevant standards:

ASTM A182/A182M-2018

Detail datasheet