ASTM A Class II Type B high chrome white iron is used in operating environments where abrasion and impact are the wear mechanisms. ASTM A standard has issued the chemical and hardness requirements for abrasion-resistant cast iron material grades, type A, B, C, D. ASTM A – Free download as PDF File .pdf), Text File .txt) or read online for free. Nihard.
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Defense manufacturing is all about project manufacturing and project accounting. This abstract is a brief summary of the referenced standard. If the issue is that they take longer to machine or they go through tooling faster, can you throw more money at the machine shop to just work through it?
Red Flag This Post Please let us know here a5322 this post is inappropriate. Then we would harden it after machining? Re-hardening is not advised as parts break easily. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other.
Historical Version s – view previous versions of standard. We anticipated HB, which is 51 to 52 Rockwell C.
For The shorter, simpler part we called for an as cast hardness of HB. These alloys may be made by melting process and shall have microstructures that consist of carbides, martensite, bainite, austenite, and in exceptional cases, minor amounts of graphite or pearlite.
High Chrome White Iron – Abrasion Resistant Cast Irons
ASTM does not give any warranty express or implied wstm make any representation that the contents of this abstract are accurate, complete or up to date. Join your peers on the Internet’s largest technical engineering professional community. Worth a shot for a few parts, for 50 parts that approach isn’t going to be realistic. The chemical composition of a class and type that is, Class I, Type A shall conform to the range of values specified for carbon, manganese, silicon, nickel, chromium, molybdenum, copper, phosphorus, and sulfur.
ASTM A Standard Specification for Abrasion-Resistant Cast Iron
asym Also, if distortion is a concern, provide some supports. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. Are you using cubic boron nitride tips or carbide tips for machining? My question is, can high chrome cast iron be “heat treated” to re-harden to HB after annealing or even tempering to ?
A machine shop has reported that some castings we sent for machining are harder than our drawing specifies. It’s easy to join and it’s free.
Download Now Defense manufacturing is all about project manufacturing and project accounting. Hi arunmrao, The shop has replied says they are using cubic boron nitride tooling.
I guess we specified the current asstm to be as asstm HB. Promoting, selling, recruiting, coursework and thesis posting is forbidden. Digital Transformation may be defined in a number of different ways by analysts or enterprise software vendors. About 2 feet mm diameter. Data sheets for overmetals, plastics, ceramics, and composites. Click Here to join Eng-Tips and talk with other members! We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error.
Combining values from the atsm systems may result in non-conformance with the standard. The following conditions for casting will be supplied: Click here to view all the property values for this datasheet as they were originally entered into MatWeb. Some of the curves in the “Abrasion Resistant Cast Iron Handbook” suggest some high chrome irons can end up with vastly different hardnesses even a52 tempering to the same temperature, depending on retained austenite.
So now we are waiting to hear from the foundry about how to get the hardness down to machinable levels. The castings already are distorted enough to require dimensional compromises. The Eng-Tips staff will check this out and take appropriate action. Metallurgy, Plymouth Tube RE: You need to check on the current structure, and perhaps do some trials. Or if you don’t have an account with us yet, then click here to register.
This specification deals with abrasion-resistant cast irons used for mining, milling, earth-handling, and manufacturing industries. Are you an Engineering professional?
ASTM A532 Class III Type A 25% Cr
Hardness test shall also be made. Converted from Brinell hardness. Thank you for helping keep Eng-Tips Forums free from inappropriate posts. And we should try to confirm the actual material. About 4 feet mm long.
We have approached the foundry to answer questions about softening and heat treating options. Students Click Here Join Us! Login to see astmm most recently viewed materials here.