Metallurgical Minutes

Machinability Guidelines and Comparisons

An often asked question is how to compare machinability of different alloys. The answer is available here on our website. The key column is relative machinability, listing speed as a percentage ...read more

Rolled Alloys Lab Services

Rolled Alloys Metallurgical Services (RAMS) is dedicated to our customers and can provide the following services at no cost: Failure analyses:  we have more than 60 years of technical experience...read more

Stress Corrosion Cracking

Stress Corrosion Cracking (SCC) is a common issue with many specialty alloys. SCC is often associated with chlorides, but can also occur with caustics and other corrosive media. The most common type ...read more

The Rolled Alloys Batting Order

You may not know it from the weather, but baseball season has started. At the beginning of every baseball game, the managers meet at home plate to give the umpires their lineups. Here at Rolled ...read more

PREn - Pitting Resistance Equivalent Number

The pitting resistance equivalent number (PREn) is a theoretical way of comparing the pitting corrosion resistance of various types of stainless steels based on the chemical compositions of those ...read more

Utilizing our Weld Wire Selection Tool

Rolled Alloys provides an online tool; the Weld Wire Selector to help determine the best wire options when welding. When visiting www.rolledalloys.com, select Weld Wire Selection from the tools menu ...read more

Ferrite Content in Austenitic Stainless Steels

The basic 300 series stainless materials like 304/L and 316/L have an austenitic microstructure and are non-magnetic.  That is, in the annealed condition they are essentially free of ferrite, ...read more

Rust and Stains on Stainless Sheet and Plate Products

Stainless steels are, unfortunately, not always stainless. Although we strive to provide products that are clean, rust free and stain free, this is not always possible to achieve.  There are a ...read more

The Origin of Alloy 20

The origin of Alloy 20 can be traced back to the invention by Carpenter Steel in 1951. The alloy was introduced as Carpenter Stainless 20 and represented the development of a wrought alloy that was ...read more

CORROSION 2016

Rolled Alloys participated with RAMS personnel Glenn Byrne, Justinn General and Paul Whitcraft.  Some highlights of the week included: To start off the week, NACE released the final report on an...read more

Ferric Chloride Corrosion Testing

ASTM has issued G48, Standard Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels and Related Alloys by Use of Ferric Chloride Solution. G48 contains six different test ...read more

CORROSION 2015 Conference

Rolled Alloys has been a long time participant in NACE® International – The Worldwide Corrosion Authority. NACE International was founded in 1943 by a group of corrosion engineers involved ...read more

Pipe Sizes and Tolerances

Steel pipe sizes around the world are standardized on  historic dimensions that are now referred to as Nominal Pipe Sizes (NPS). In addition to standardizing the nominal outside diameter (OD), a ...read more

Facts About LME

LME – No, we’re not talking about the London Metal Exchange!  LME in this case stands for Liquid Metal Embrittlement. Molten metal can cause a variety of problems in a range of ...read more

Dual Certification

The term "dual certification" is most commonly used to refer to the practice of certifying a material as meeting the requirements of a specification(s) as two different alloys. The most common example...read more

The Unified Numbering System

The Unified Numbering System (UNS) is an alloy identification system created in the early 1970’s and formalized with the issuance of joint standard ASTM E527 and SAE J1086 in August of 1974. The...read more

Why? Why? Why? 316Ti – UNS S31635

It is common to find a connection to a German equipment manufacturer or design. However, 316Ti is practically non-existent in North American inventory, and usually requires a mill production run. ...read more

Bar Product Terminology and Finish

The terminology used for bar products is occasionally misunderstood. General requirements, such as those for tolerances, marking, packaging, etc., are standardized in ASTM A484 for stainless bar ...read more

RAMS Blog – Seeking Your Advice

Within these areas we have touched on properties and applications of established and newer alloys.  We have discussed issues to consider when ordering material, such as flatness and standard ...read more

Pitting Corrosion

What is pitting corrosion and how does it happen? Pitting corrosion is in itself a corrosion mechanism, but is also a form of corrosion often associated with other types of corrosion mechanisms. It is...read more

The Debate: Cast vs Wrought, Which is Better?

Both castings and wrought alloys have their place in the heat treating world, but learn where and when to use each. For example, cast materials typically have higher yield, tensile and creep strengths...read more

RA330: Over 60 Years of Proven Success in the Heat Treat Industry

RA330 has a proven history for use in high temperature applications, and is a very versatile material.  With a nominal composition of 35 Ni and 19 Cr, chemically it is more than a stainless steel...read more

Is there a difference between Billet and Bar?

The difference is subtle but extremely important! Billet is a semifinished round which has been partially worked, but will be further worked to final size.  Bar is finished material that has ...read more

High Temperature Creep Rates and Creep Rupture

Creep-Rupture Why short term yield and tensile properties may not be useful at high temperatures. Metals behave much differently at high temperatures than they do near room temperature. If a metal bar...read more

Plate Product Thickness Variations

With the increased capability of hot mills to rolls heavy coil (up to ½” thick) product in stainless and nickel alloys, has come an increased awareness of the thickness variations that ...read more

Plate and Sheet Flatness

We would prefer if all plate and sheet were “flat”.  Unfortunately, the reality is quite different and the standard commercial specifications to which these products are produced ...read more

Wet Scrubber Ductwork using Rolled Alloys 253 MA

Recently, Envitech was tasked by a leading waste oil refiner in Southern California to supply and install a wet scrubber on a process gas afterburner.  The goal of the project was to reduce the ...read more

How does a brand name provide a benefit?

ZERON 100 Super Duplex Compared to Generic S32760 Super Duplex. ZERON® 100, developed as a wrought super duplex in the 1980s, was given the code UNS S32760 in 1989.  Since that time several ...read more

What is alloy sensitization?

What alloys are prone to sensitization and how to avoid it? Sensitization refers to the precipitation of carbides at grain boundaries in a stainless steel or alloy, causing the alloy to be ...read more

Looking for an EN10204, 3.2 Certification?

EN10204 is a Euronorm (issued by the European Community) specification that describes different types of material test reports and certifications.  The standard contains no requirements relative ...read more

Does choosing the best material for the job have you stymied?

It isn’t an exact science and it is often necessary to be guided by past experience and to make informed judgments based on sometimes incomplete information or data. Consider using the expertise...read more

How to weld Duplex Stainless Steel

I often receive questions on the correct parameters for welding duplex stainless steels. There seems to be a lot of confusion on which practices and quality checks are best. I also notice that each ...read more

ZERON 100 Selected to Replace C-276 Heat Exchanger Tubes

A Spanish hydrometallurgical plant was using C-276 heat exchanger tubing to heat a raffinate solution.  The tubes had steam on the outside at 155°C (inlet) to 100°C (outlet) and raffinate...read more

How to Measure Tensile Strength, Elastic Modulus, and Ductility

Tensile Strength Tensile strength, or ultimate tensile strength, measures a metal’s resistance to breaking or pulling apart in two pieces.  To find out how strong a wire is, one could just ...read more

Galvanic Corrosion

Here is a good paper written by Roger Francis on “Galvanic Corrosion of High Alloy Stainless Steels in Sea Water” The coupling of dissimilar metals in conducting, corrosive solutions such ...read more

Selecting Filler Metals for Dissimilar Alloy Welding

Have you ever wondered what is the best filler metal for welding two different alloys together? A common question I receive is the proper alloy filler metal for joining two dissimilar metals.  ...read more

What is a Duplex Stainless Steel?

Did you know that duplex stainless steels such as LDX2101 lean duplex (UNS S32101), 2205 (S32205) and ZERON® 100 super duplex (S32760) are made up of two phases? Unlike 300 series stainless steels...read more

ZERON 100 (S32760) is a Cost Saving Option for Seawater

ZERON 100 (S32760) is a superduplex stainless steel with 50% austenite and 50% ferrite. This gives the alloy the benefits of the austenitic microstructure, such as ductility, and also those of the ...read more

Rolled Alloys paper presented at EPRI Conference in Orlando

On June 23, Devin Wachowiak gave a presentation at the EPRI Conference in Orlando, FL on the successes of AL-6XN and ZERON 100 in pollution control, more specifically for applications within Flue Gas ...read more