elongation of ASTM A436 type 2 austenitic iron
elongation of ASTM A436 type 2 austenitic iron
(OP)
We have some grids (~1.5 inch x 3 inch rectangular bars about 1 foot long) cast for a hammer mill, and specify ASTM a436 type 2 material normalized.
Normal operating temp is probably 300 degrees F or so, maybe up to 500-600 briefly if things go wrong.
To appease some customers' desire for longer wear life we'd like to cast them out of Hihard 1 or something similar.
Folks are concerned that the NiHard's brittleness would cause a problem when some tramp iron sneaks into the mill, since there is equipment downstream from the grids that would get smashed. Our early literature states one function of the grids is indeed to act as a filter to protect that downstream stuff, so if the grid broke the tramp iron could make a me$$.
I have found no indications that A436 has any elongation worth mentioning, so if the A436 grids historically have offered sufficient smash protection, I wonder why the Nihard 1 wouldn't too.
Before doing comparative charpy or some other type of tests (perhaps I'll post the sledge hammer single point bend test if I survive), is there some obvious flaw in this reasoning?
thanks,
Dan T
Normal operating temp is probably 300 degrees F or so, maybe up to 500-600 briefly if things go wrong.
To appease some customers' desire for longer wear life we'd like to cast them out of Hihard 1 or something similar.
Folks are concerned that the NiHard's brittleness would cause a problem when some tramp iron sneaks into the mill, since there is equipment downstream from the grids that would get smashed. Our early literature states one function of the grids is indeed to act as a filter to protect that downstream stuff, so if the grid broke the tramp iron could make a me$$.
I have found no indications that A436 has any elongation worth mentioning, so if the A436 grids historically have offered sufficient smash protection, I wonder why the Nihard 1 wouldn't too.
Before doing comparative charpy or some other type of tests (perhaps I'll post the sledge hammer single point bend test if I survive), is there some obvious flaw in this reasoning?
thanks,
Dan T





RE: elongation of ASTM A436 type 2 austenitic iron
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"It's better to die standing than live your whole life on the knees" by Peter Mayle in his book A Good Year
RE: elongation of ASTM A436 type 2 austenitic iron
This puts the elongation for D-2 as 8% so its small but not zero and it has significant toughness.
RE: elongation of ASTM A436 type 2 austenitic iron
While in the hammer mill ,used for crushing, D-2 is rarely selected, it is always a wear resistant grade . Please correct me,if I have erred.
_____________________________________
"It's better to die standing than live your whole life on the knees" by Peter Mayle in his book A Good Year
RE: elongation of ASTM A436 type 2 austenitic iron
RE: elongation of ASTM A436 type 2 austenitic iron
The material is very tough and actually has decent wear properties.
Any of the white irons would be like using glass, don't go there.
If you do look at austenitic manganese steels (14% Mn, 1% C) you will need to have them pre-surface hardened to get good results.
This can be done with impact or explosives. Rail switch guys are good at this.
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