CAL D-50

Applications

With almost double the yield strength of 316L, superior corrosion resistance, excellent cryogenic properties and extremely low magnetic permeability D-50 is a preferred choice over many other austenitic stainless steels.

It is used extensively in petrochemical, oil exploration, chemical fertilizer, nuclear fuel processing, paper, textile and food processing industries. It also finds many applications in the marine sector. Typical component applications include fasteners, pumps, marine hardware, valves and many other end uses which require high strength coupled with excellent corrosion resistance. Where other austenitic stainless steels are marginal as regards properties, D-50 offers a cost-competitive alternative and also offers a competitive edge on some of the more expensive alloys such as super duplex and nickel-based alloys.

Related Specifications

USA

Bar
- ASTM A193, ASTM A194, ASTM A276, ASTM A314, ASTM A479, AMS 5764
Plate
- ASTM A240 and AMS 5861
Forgings
- ASTM A182M, ASTM A193, ASTM A194, ASTM A276, ASTM A479, AMS 5764 NACE MR-O1-75/ISO 15156-3, NACE MR0103-2003, Schlumberger SH329392 & SH619188

Europe

DIN 1.3964, X2CrNiMnMoNNb21.16.5.3

Welding

In addition to the superior mechanical properties and corrosion resistance, D-50 can be welded successfully by using conventional processes normally associated with austenitic stainless steels.

Inert gas shielding of the weld pool is important to prevent gas absorption from the atmosphere which could result in porosity.

Stainless steel is readily weldable with arc processes and has excellent weld joint properties which can be obtained without the need of pre-heating or post weld heat treatment. When welding, matching filler rod should be used such as XM-19W (AWS E/ER 209) and DIN 1.3964.

Benefits of CAL D-50

This unique austenitic stainless steel has superior strength and corrosion resistance when compared to conventional stainless steels such as 317L, 316L, 304L and 321.

D-50 builds on the UNS S20910 XM-19 material specification, offering consistent superior mechanical strength and resistance to various corrosion types in seawater environments.

It also maintains its mechanical strength at both elevated and sub-zero temperatures and, unlike other stainless steels does not become magnetic when cold worked.

Sulphide Stress Cracking

Field service experience has confirmed the resistance of XM-19 to sulphide stress cracking in both air and oil field applications. D-50 was included in the 1996 revision of NACE MR-01-75 “Sulfide Stress Cracking Resistance Metallic Materials for Oil Field Equipment” at hardness levels up to RC 35 maximum.

Stress Corrosion Cracking Resistance

When laboratory tested under accelerated conditions in boiling 42% MgCl₂ solution the alloy came between 304 and 316 stainless in its resistance to cracking.

Sea Water Corrosion

D-50 has excellent resistance to pitting and crevice corrosion in seawater applications. It is more resistant than 316L stainless steel where crevice corrosion can occur under marine molluscs or other marine organisms. Tests have indicated only a 0.025mm (0.001”) attack under marine attachments when exposed for 18 months.

Intergranular Attack

When sensitised at 675°C (1250°F) for one hour D-50 has excellent resistance to intergranular attack. If material is annealed at 1066°C (1950°F) it also has good resistance to intergranular attack for many applications. However, for thicker sections that are to be welded and used in strongly corrosive components, a higher pre-anneal at 1121°C ( 1121°F) is preferred to optimise the corrosion resistance.

Copper Alloys’ D-50 Stainless Steel

Benefits of CAL D-50

Sulphide Stress Cracking

Stress Corrosion Cracking Resistance

Sea Water Corrosion

Intergranular Attack