Blog Heat Resistant Stainless Steel Material Profiles:Part 1

Grade

• MTEK 20-10 (J92603 / HF) Heat Resistant Stainless Steel

Description

• Economical heat resistant grade containing enough chromium and nickel for good resistance to oxidation.

Properties – Why select this material

• Economical heat resistant grade
• Service limit 1600°F / 870°C

Applications – Frequent uses

• Convection tube sheets
• Return bends
• Burner tips
• Gas burner rings

Grade

• MTEK 25-12 TYPE II (J93303 / HH TYPE II) Heat Resistant Stainless Steel

Description

• This stable austenitic alloy contains enough chromium for scaling resistance at high temperatures.

Properties – Why select this material

• Suitable for a wide range of high temperature applications
• Service limit 1800°F / 980°C

Applications – Frequent uses

• Convection tube supports

Grade

• MTEK HK40 (J92404 / HK40) Heat Resistant Stainless Steel

Description

• A chrome-nickel grade suitable for low stress reformer applications.

Properties – Why select this material

• Increased levels of silicon provide improved carburization resistance
• Service limit 1875°F / 1020°C

Applications – Frequent uses

• Catalyst tubes
• Heat treating furnace components
• Hearth rollers
• Coating furnace rolls
• Ethylene cracking furnace coils

Grade

• MTEK 24-24Nb Heat Resistant Stainless Steel

Description

• Heat resistant alloy with improved stress rupture properties compared to HK-40.

Properties – Why select this material

• Permits use of thinner sections and/or higher operating temperatures under the same loads than HK
• Service limit 1875°F / 1020°C

Applications – Frequent uses

• Catalyst tubes
• Ethylene cracking furnace coils

Grade

• MTEK 25-35 (N08705 / J95705 / HP) Heat Resistant Stainless Steel

Description

• This is an extension of HK alloys with 15% added nickel content.

Properties – Why select this material

• Increased strength at elevated temperatures
• Service limit 1925°F / 1050°C

Applications – Frequent uses

• Catalyst tubes
• Ethylene cracking furnace coils

Grade

• MTEK 25-35Nb (HP Modified / HP Nb) Heat Resistant Stainless Steel

Description

• High temperature alloy with improved stress rupture properties and carburization resistance.

Properties – Why select this material

• The addition of niobium improves stress rupture strength through the formation of niobium containing carbides that are more stable at higher temperatures
• The presence of niobium improves carburization resistance, but lowers ductility
• Service limit 2010°F / 1100°C

Applications – Frequent uses

• Hydrogen reformer furnaces
• Ethylene cracking furnace

Grade

• MTEK 25-35LC (HP Modified Low C) Heat Resistant Stainless Steel

Description

• Low Carbon version of HP Modified petrochemical furnace alloy.

Properties – Why select this material

• Low carbon version of this alloy offers increased ductility
• Improved repair ability over 25-35Nb
• Service limit 1925°F / 1050°C

Applications – Frequent uses

• Pyrolysis furnace sweep bends
• Reformer furnace outlet manifolds

Grade

• MTEK 25-35MA (HP Micro Alloy) Heat Resistant Stainless Steel

Description

• Micro-alloyed HP material with small additions of titanium and rare earth elements.  

Properties – Why select this material

• The addition of the micro alloys supports high temperature stability
• The material combination forms especially tenacious oxide films that reduce surface oxidation
• Service limit 2100°F / 1150°C

Applications – Frequent uses

• Pyrolysis furnace sweep bends
• Reformer furnace outlet manifolds

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