Rolled Alloys Blog

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

Duplex Grain Size in Austenitic and Nickel Based Super-alloys

Metals have a crystalline structure. When a metal solidifies from the molten state, a multitude of tiny crystals start to grow. These crystals form the grains in the solid metal.  As a wrought ...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

Inclusions and Laminations

Inclusions and laminations naturally exist in all metal and alloy products. Most people hear the words inclusion or lamination and think defect, but one should not fear these words and automatically ...read more

Temperature Limits - What Do They Really Mean?

Data sheets for most heat resistant alloys list a temperature limit. What does this temperature limit really mean? Can material always be used up to that temperature limit? The answer is: it depends. ...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

What condition is your PH or age-hardenable steel in?

There is a lot of confusion about the condition that age hardenable materials, such as 17-4 or 718 are in.  Are they annealed, solution annealed, or aged and how can you tell?  These ...read more

The 1953 introduction of RA330

In 1953, when Rolled Alloys was founded as an independent company, RA330 was introduced as a wrought alternative to cast HT, which at the time was a 35% Ni, 15% Cr alloy. In 1958, the chemistry was ...read more

RA 602 CA for the Most Severe High Temperature Applications

  RA 602 CA® is an alloy for the highest temperature applications, in most environments. This is why we call RA 602 CA the high temperature powerhouse alloy.     Cr Ni C ...read more

Heat Distortion

When metals are heated, they expand. The amount of expansion to be expected is well defined in most cases as the coefficient of thermal expansion is a commonly reported physical property for most ...read more

RA 253 MA Alloy – Still Growing, After All These Years

While RA330® has been a solid alloy choice for carburizing, nitriding and many other heat treating applications, stainless alloys such as 304H, 309 and 310 are also used extensively in industrial ...read more

6% Molybdenum Superaustenitic Alloys

This class of alloys was introduced in the early 1970s, largely in response to the need for a cost effective alloy with resistance to brackish water or seawater environments.  The main driving ...read more

Confused about Annealing / Heat Treating Terminology?

In the broadest sense annealing is the process of heating an alloy to an elevated temperature to promote a homogenous chemistry, equiaxed microstructure and uniform mechanical properties  to ...read more

Searching for a Furnace Fixture Alloy?

There are many different types of furnace fixtures and many different alloys to choose from, but for many furnace and other high temperature applications, RA330® is a logical first choice. Since ...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

RA 602 CA: Strongest & Most Heat Resistant Alloy Available from Stock

RA602CA is a nickel base alloy that can be used for many severe high temperature applications.  This alloy nominally contains 63 Ni, 25 Cr, 2.2 Al, and small quantities of Zr, Y, and 0.2 C. ...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

Polysilicon plant in China selects RA330 for longer life.

In the U.S., RA330 is the workhorse of the heat resistant alloys. It has good strength, carburization and oxidation resistance to 1150℃. If the application is in high working temperature with ...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

Selecting a Material for High Temperature Service

Having trouble selecting materials for applications in high temperature environments? The checklist below will help with the questions that you will need to ask for proper material selection. It is ...read more

How does RA 253 MA compared to 309 and 310?

The main differences between RA 253 MA and both 309 and 310 stainless steel are the additions of cerium, increased silicon and nitrogen to RA 253 MA. RA 253 MA also has a lower alloy content of nickel...read more

Do You Use Silicon-Carbide Hearth Plates?

Nickel-base or nickel rich alloys are highly suited for high temperature application, especially carburising ones. This makes them attractive and suitable for high temperature environment; heat ...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

Sigma Formation

Do you know what elements cause sigma formation? Will 310S or 304H have more resistance to sigma formation? All of our nickel-bearing stainless and nickel base alloys have an austenitic structure, ...read more

Thermal Fatigue Cracking

Thermal fatigue cracking is the cracking that happens after a metal is repeatedly heated and cooled rapidly. Heat resistant alloys all have high coefficients of thermal expansion; most of which expand...read more

Sulfidation

Environments containing sulfur may rapidly attack high nickel alloys. The problem is more severe under reducing, or low oxygen, environments. The higher the nickel content of the alloy the more ...read more

Carburizing

Carburizing is one of the most commonly performed steel heat treatments. For perhaps three thousand years it was performed by packing the low carbon wrought iron parts in charcoal, then raising the ...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

RA330 (N08330) – The Ageless Heat Resistant Alloy

RA330 has been the alloy of choice in the heat treating industry for almost 60 years. With the ability to withstand extreme temperatures up to 2100°F and the endurance to handle heavily cyclic ...read more

RA 253 MA Round Bar

RA 253 MA has twice the creep strength of 310 stainless above temperatures of 1600F and has great oxidation resistance up to 2000F, similar to that of 310. However, you may not have known that the ...read more