ISO 15608 Material Groups

Material Group 52 EN ISO 15608: Titanium alpha alloys ^a

^a Alloys covered by group 52 are:
Ti-0,2Pd, Ti-2,5Cu, Ti-5Al-2,5Sn, Ti-8Al-1Mo-1V, Ti-6Al-2Sn-4Zr-2Mo and Ti-6Al-2Nb-1Ta-0,8Mo;

Features of Grade 12

Highly weldable and fabricable Ti alloy offering improved strength and pressure code design allowables, hot brine crevice corrosion, and reducing acid resistance compared to Ti Grades 1, 2, and 3. Approved for sour service use under the NACE MR0175/ISO 15156 Standard.

Typical materials in group 52

Material Group 53 EN ISO 15608: Titanium alpha-beta alloys ^b;

^b Alloys covered by group 53 are: Ti-3Al-2.5V, Ti-6Al-4V, Ti-6Al-6V-2Sn, Ti-7Al-4Mo;

Features of Titanium alpha-beta alloys

Grade 5:
Ti-6Al-4V (Titanium Grade 5) is the most widely used of all the alpha-beta titanium alloys accounting for more than 50% of total titanium usuage. It is typically used in the annealed condition, at service temperatures through 400°C (750°F).
A major industrial application for this titanium grade is in heat transfer applications such titanium condenser, shell and tube heat exchangers and plate and frame heat exchangers are used extensively in power plants, refineries, chemical plants and offshore platforms. Grade 5 is readily weldable using GTAW or TIG processes if adequate shielding is provided using pure inert gas (Argon or Helium). Use of a trailing shield is recommended. Titanium must be free of oil, grease or other contamination before welding.

Grade 9:
Medium strength, non-ageable Ti alloy (Ti-3Al-2.5V) offering highest strength and design allowables under the pressure vessel code, with good weldability and cold fabricability for mildly reducing to mildly oxidizing media. It offers 20 to 50% higher tensile strength than the commercially pure titanium at room and elevated temperatures. It is much more amenable to cold working than Ti 6AI/4V alloy and can be cold worked 75 to 85% to result in moderately high strength and good ductility. 

Grade 28:
Ru-enhanced version of (Ti-3Al-2.5V–Ru) with equivalent physical and mechanical properties and fabricability, offering elevated resistance to dilute reducing acids and crevice corrosion in hot halide (brine) media. Approved for sour service use under the NACE MR-01-75 Standard.

Grade 38:
Is an alpha-beta titanium alloy that uses iron and vanadium as beta stabilizers as well as aluminum as an alpha stabilizer. The lower aluminum and vanadium contents and higher oxygen and iron contents give ATI 425® alloy a unique combination of ductility and tensile strength. The excellent ductility permits forming at room temperature. Is easily welded in the annealed condition using methods typically applied to titanium, such as TIG, MIG.

Typical materials in group 53

Material Group 54 EN ISO 15608: Titanium near beta and beta alloys ^c

^c Alloys covered by group 54 are:
Ti-10V-2Fe-3Al, Ti-13V-11Cr-3Al, Ti-11.5Mo-6Zr-4.5Sn, Ti-3Al-8V-6Cr-4Zr-4Mo;

Ti-3Al-8V-6Cr-4Zr-4Mo

This grade is a metastable beta titanium alloy known of its exceptional ductility in the solution treated (annealed) condition, and for its heigh strength and ductility in the solution treated and aged condition. Improved tensile properties can be achieved , while maintaining good ductility and low modus of elasticity. Fatigue strength is also good in the solution treated and aged condition.
This grade find applications in high strength commercial applications, structural parts , gas and petroleum down-hole and piping systems and fasteners and can be used for extended periods in elevated temperature environment below 349°C.

Typical materials in group 54

Material Group 61 ISO/TR 1568: Pure zirconium

Features of pure Zirconium

Zirconium, a reactive metal, ha s high affinity for oxygen that results in the formation of a protective oxide layer in air at room temperature. This protective oxide gives this alloy their superior corrosion resistance and this oxide layer can be enhanced through a heat process.

This material exhibit good ductility even at cryogenic temperatures and good strength comparable with other common engineering alloys.

Applications of pure Zirconium

One of the major applications of Zirconium is as a corrosion-resistant material of construction for the chemical processing industry. Zirconium exhibits excellent resistance to corrosive attack in most organic and inorganic acids, salt solutions, strong alkalis, and some molten salts. Some of the more important areas in the chemical processing industry where Zirconium is being used include Reboilers, Evaporators, Tanks, Packings, Trays, Reactor Vessels, Pumps, Valves and Piping.

This material is ideal for heat exchanger applications. The linear coefficient of thermal expansion of this material is nearly one-third of the value for stainless steel giving this material superior dimensional stability at elevated temperatures.

Zirconium is weldable and the stress relief heat treatment after welding (PWHT) should be performed within 14 days after welding.

Typical materials in group 61

Material Group 62 EN ISO 15608: Zirconium with 2,5 % Nb

Features of Zirconium with 2,5 % Nb

This material is alloyed with niobium to increase its strength and improve its formability. Zirconium, a reactive metal, ha s high affinity for oxygen that results in the formation of a protective oxide layer in air at room temperature. This protective oxide gives this alloy their superior corrosion resistance and this oxide layer can be enhanced through a heat process.

This alloy exhibit good ductility even at cryogenic temperatures and good strength comparable with other common engineering alloys.

This alloy is ideal for heat exchanger applications. The linear coefficient of thermal expansion of this material is nearly one-third of the value for stainless steel giving this material superior dimensional stability at elevated temperatures.

Zirconium is weldable and the stress relief heat treatment after welding (PWHT) should be performed within 14 days after welding.

Typical materials in group 62

Material Group 71 ISO 15608: Grey cast irons with specified tensile strength or Brinell hardness

Typical materials in group 71