Blog Heat Resistant Stainless Steel Material Profiles:Part 1

By: Dave Olsen

alloy guide banner

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.

Download Our Alloy Guide

Download Our Where Used Guide

Related Blogs

Follow Us