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Yes, I take risks without assurances of success. It's my weeknes. Anyway,ASTM specification B26 temper T5. Parts are already poured - no trial. Luckily for me they look great. I fluxed, degased,refined our usual way. Pour temp. 1200 F -1220 F, shell temp. 300 F - 400F.

Gentlemen, for those of you in aluminum, We've pouring 355.0 and 356.0 for for many years now, and I'm familiar with melting, processing, etc. of these alloys. Recently, we got an order for parts cast in 713.0 (parts investment process, casting wt. .75 lb, wall thickness .375''). I have to get...

That you for advise guys - all makes sense.

WKTaylor Actually, all of the above.Customer clearly spelled out "1 h @ 900F", so that's what we did. I was just concerned as to properties being uniform for shaft that thick. If there's a problem, I'll recommend H925 for 4 h (slight decrease in hardness may not matter), or take Ed advise...

Following austanitizing this steel can be further process by aging at temperatures based on properties required. Condition 900 calls for holding at this temp. for 1 h. Question is: what if part is "chunky" ie. 5'' or 6'' in dia. Shouldn't I hold at this temp. for much longer?

This alloy can have a variety of heat treatments applied: Process anneal, full anneal and of course hardened and temper. However, normalizing is not recommended for this alloy. Why not?

A356 alloy has much higher Si content then 6063, so has better fluidity, easier to cast, feed, it's harder, stronger then 6063 but lower ductility. Somewat harder to machine. The properties will vary with heat treatment. A 356 is a good alloy for thin section, leak tight castings. It also...

The strength will vary widely depending on heat treatment you would choose for this particular alloy and the casting process. This grade is simply a slightly higher manganese version of 1070. In fact, it is used for purposes that parallel application of 1070. Example - Yield Strength for cold...

How about 2507 duplex steel? You get min. 115 ksi tensile strength, max. operating temperature up to 600F, and I think this alloy is designed for use in salt water.

Normalizing casting prior riser removal may help, but will not solve the problem. Besides, why would one want to waste oven resources, heat treating risers (castings with risers still attached)? One solution is to cut off the riser with high rpm chop off saw. This is what we do in our foundry...

OK. it works fine, granted you have Microsoft Excel program on your computer, if you don't - you should. It's very useful tool. I'll upload now just a template spreadsheet with no values entered, although first file can be used for calculations - no...

Composition range is usually given for metals chemistry. For example 410SS C:.05-.15, Mn:1max, Si:1max, Cr: 11.5-13.5, Ni:.5max If you have 100g of metal at .75%Ni and need to have 7%Ni concentration, then you need to add 6.25g of Ni. Ferro Alloys will vary in alloy concentration, so you need...

Thanks metengr, all makes sense, I should've known that.

We supply 4140 and 4340 castings in normalized condition. Customer Q&T parts to obtain desired properties (hardness, strength). My question is: what difference would it make, if these alloys, and plain carbon steel ie. 1045 for that matter, were Q&T without normalizing? How microstructure thus...

As arunmrao mentioned, you probably mean solidification range. You see, the temperature at which freezing begins is called the liquidus, and the temperature at which freezing is complete the solidus. Between these temperatures exists an area consisting of both liquid and solid metal caled mushy...

I'm not sure the EN specification, but the German Standard would be: DIN SEW 410 - grade: GX5CrNiMo165

I wouldn't use this steel for applications that are subject to prolong temperature above 800F, because this produces graphitazation - pearlite will slowly transform to graphite rendering steel brittle.

arunmrao Just came across your post. You hardly ask any questions, you're the dude always with the answers. Anyway, if I can add my 2 cents, though it's probably to late. We cast dozens of parts for mining industries from a few lb to 1000lb, mostly in 4340 and some in 4140. We supply castings in...

When parts are austenized under condition that doesn't provide some form of surface protection, your parts may get coated with rust (oxidized), and/or decarburized. And to put it very simply, the mechanism of decarburization is that the carbon in steel (under high temp.)reacts with the...

There's probably nothing wrong with your investigation. 1. What final hardness you looking for? If you temper 52100, at 800F you should get about 45HRC. 2. How you conduct your heat treatment process. (see attached recommended heat treating practice for 52100). 3. And your assumption is...