Steel "graiñ"??

S

Sean Riley

Joined
Jan 28, 2024
Messages
76
Good morning, and hello. A question for the folks smarter than me. Does the grain structure, like " How was the steel stock rolled out flat" and the "Cut" of your blade stock. With or across the"grain"?? Matter that much in a stock removal blade? Small chopper/ "survival" knife applications. In a high carbon steel 1095/5160? Or a better hard use steel? Powder steel aside. I don't know anyone who can heat treat cryo a single blade.
 
Does anyone know if most supply houses cut with the grain or against it? I often buy bars of steel (not full sheets) and would have no control over which way the bar was cut from the sheet originally?
 
Taz said:
Does anyone know if most supply houses cut with the grain or against it? I often buy bars of steel (not full sheets) and would have no control over which way the bar was cut from the sheet originally?
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I am wondering the same thing?
 
DevinT said:
Toughness goes down when blades are cut out in the transverse direction, especially at the tip.

It’s best to cut them out in line with the rolling direction.

Hoss
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Hoss, is there an idea just how much strength is lost with the transverse cut? 1%? 10%?

Seems like I remember warp is a bit more of a problem with transverse cuts?
 
Who has and where to get a traverse?? Piece of transverse . With the roller direction, traverse? across the roller direction, transverse? Powder steel act any differently? With the same theory? Thanks for any input. Maybe overthinking it?
 
Ken H> said:
Hoss, is there an idea just how much strength is lost with the transverse cut? 1%? 10%?

Seems like I remember warp is a bit more of a problem with transverse cuts?
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Conventionally cast wrought steel is twice as tough in the rolling direction as opposed to the transverse direction.

They get closer at the higher end of hardness. Other factors are impurity levels, grain size, heat treating practice etc.

PM steel does better in the transverse direction but is not as tough as the rolling direction.

Hoss
 
DevinT said:
Conventionally cast wrought steel is twice as tough in the rolling direction as opposed to the transverse direction.

They get closer at the higher end of hardness. Other factors are impurity levels, grain size, heat treating practice etc.

PM steel does better in the transverse direction but is not as tough as the rolling direction.

Hoss
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Outstanding, thank you for sharing. How does a person know how and what steel is sold like that?
 
If you get your steel from a reputable steel supplier in longer bars it will be in the right direction.
 
Doesn't heat treating the steel reset the grain and therefore there is no "direction" as left by the rollers? Heating above the critical temperature causing the grains to dissolve and reform in a new pattern when cooled?
 
Backyard said:
Doesn't heat treating the steel reset the grain and therefore there is no "direction" as left by the rollers? Heating above the critical temperature causing the grains to dissolve and reform in a new pattern when cooled?
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Good question? Thank you for your time.
 
Backyard said:
Doesn't heat treating the steel reset the grain and therefore there is no "direction" as left by the rollers? Heating above the critical temperature causing the grains to dissolve and reform in a new pattern when cooled?
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No, HT resets the grain size and boundaries, not the direction of the Grain". They are two different things. Only melting can change the direction of the grain.
 
S Sean Riley
B Backyard

Some metallography I did for Dr Larrin for his upcoming article.

This is an extreme example, but it should highlight the point about "Direction of Grain"
iuxzPXj.jpeg

This steel is in the hardened and tempered condition. The carbides bands and stringers will still have a direction to them.

More information about this particular steel and what it is in Dr Larrin's upcoming article.
 
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