Blog Heat Resistant Stainless Steel Material Profiles:Part 2

By: Dave Olsen

alloy guide banner

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.

Download Our Alloy Guide

Download Our Where Used Guide

Related Blogs

Follow Us