Q: What Types of Metals Are Used to Make Exhaust Systems?

asked by on

What types of metals are used to make exhaust systems?

Chances are good that your exhaust system is made from 400-series steel. Cast iron is used for the exhaust manifold (stock). Aluminized steel is often used in aftermarket exhaust systems. In addition, a wide range of other metals can be added to the mix as alloys to provide greater strength or corrosion resistance depending on the type of exhaust in question.

Modern automotive exhaust system design, development, and manufacturing is mandated for the vehicle to be price competitive, application specific, and meet regulations. Material selection for the exhaust system plays a vital role due to the increased warranty requirements and regulatory compliances.

Exhaust system materials should possess high temperature oxidation resistance, thermo mechanical vibration resistance, external salt corrosion resistance and internal acid/base corrosion resistances.

The materials mostly used in exhaust systems are cast iron, stainless steel, mild steel / carbon steel. Recent trends towards light weight concepts, cost reduction and better performance, have led to the use of sheet metals. Nowadays, stainless steels are used in flexible bellows, catalytic converter, resonators, mufflers, pipes. Mild steel / carbon steel are used for flanges, pipes, and mufflers.

Stainless steel began as the material for decoration trims in automobiles. However, in recent years, it is mostly used as the material for exhaust systems. Exhaust system components have changed from conventional cast metals and aluminized carbon steel sheets to stainless steels, and from general-purpose stainless steels to specialty stainless steels of higher performance. This is due to stainless steels good performance and characteristics of high temperature, high corrosion resistance and appearance while meeting the modern needs for clean exhaust gases and reduced weight for better fuel economy.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. What Types of Metals Are Used to Make Exhaust Systems?

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Hi, I am hearing a very loud "rolling thunder" noise while driving that gets louder at higher speeds.. What could be the issue?

Hello. There are several components that will cause these noises when accelerating. Typically they are related to the exhaust system. You may be experiencing an exhaust leak for one option. This can occur when a hole has found its way...

Q: Once started, car turns off and backfires - 1996 Nissan 300ZX

Any time a car isn't starting I remember the 3 things an engine needs to run. It needs air, fuel, and spark. It sounds like your starter is working fine otherwise you wouldn't be almost running and backfiring. My gut...

Q: Very loud and distracting exhaust

The exhaust system on your Versa is very prone to corrosion and failure at the weld joints and internal muffler components. Nissan warranty coverage is basic and no recalls or technical service bulletins cover this problem. There are other owners...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.