Blog Heat Resistant Stainless Steel Material Profiles:Part 2

Grade

• MTEK 25-35W Heat Resistant Stainless Steel

Description

• HP material modified with Tungsten.  

Properties – Why select this material

• The addition of tungsten increases rupture strength due to the formation of very stable tungsten carbides
• A disadvantage of this alloy is its low ductility, particularly after service
• Service limit 2100°F / 1150°C

Applications – Frequent uses

• Ethylene furnace coils – especially the hot leg

Grade

• MA-1 Heat Resistant Stainless Steel

Description

• High temperature alloy modified with additions of tungsten and cobalt.  

Properties – Why select this material

• The high nickel content of this alloy combined with additions of tungsten and cobalt produce good high temperature strength and carburization resistance
• Used in petrochemical applications operating at higher temperatures and pressures than are possible with conventional heat resistant materials
• Improved high temperature creep capability over 30-50W
• Service limit 2155°F / 1180°C

Applications – Frequent uses

• Reformer Harp Assemblies
• Radiant and convection tube supports and hangers
• H₂ reformer furnace tubes for DRI

Grade

• MTEK 25-35NbW Heat Resistant Stainless Steel

Description

• This HP alloy is modified with tungsten and niobium.  

Properties – Why select this material

• High carburization and oxidation resistance
• Service limit 2100°F / 1150°C
• Higher elevated temperature strength than 25-35Nb

Applications – Frequent uses

• Ethylene cracking coils – particularly the hot leg

Grade

• MTEK 30-50W Heat Resistant Stainless Steel

Description

• Nickel base alloy with tungsten addition that provides exceptional strength.  

Properties – Why select this material

• This material also has good resistance to carburization and oxidation
• Used in furnace designs where higher temperatures are required
• Service limit 2130°F / 1170°C

Applications – Frequent uses

• Higher temperature furnaces
• H₂ reformers used in DRI

Grade

• MTEK 35-45 Micro-Alloy Heat Resistant Stainless Steel

Description

• High temperature petrochemical alloy.  

Properties – Why select this material

• Superior to 25-35MA for carburization resistance
• Improved resistance to metal dusting
• Service limit 2100°F / 1150°C

Applications – Frequent uses

• Suitable for components operating in hot zones of pyrolysis coils
• Components of reformer outlet manifolds

Grade

• MTEK 50-50Nb Heat Resistant Stainless Steel

Description

• High temperature petrochemical alloy for slightly lower temperatures.  

Properties – Why select this material

• A nickel base high temperature corrosion resistant specialty alloy
• Resists fuel-ash corrosion, specifically sulfur and vanadium attack
• Service limit 1740°F / 950°C

Applications – Frequent uses

• Petrochemical furnace components

Grade

• MTEK 20-32Nb (CT15C) Heat Resistant Stainless Steel

Description

• Low carbon, niobium strengthened petrochemical alloy.  

Properties – Why select this material

• Offers excellent rupture ductility
• Features improved thermal shock resistance
• Service limit 1800°F / 980°C

Applications – Frequent uses

• Petrochemical manifolds
• Headers
• Transfer lines

Grade

• MTEK Super 20-32Nb Heat Resistant Stainless Steel

Description

• Low carbon, niobium strengthened petrochemical alloy.  

Properties – Why select this material

• Superior creep rupture strength over conventional 20-32Nb (CT15C) material
• Service limit 1900°F / 1040°C

Applications – Frequent uses

• Petrochemical collection manifolds
• Headers
• Transfer lines

For guidance in selecting the appropriate alloy in your application, contact us.