What is the Brinell Hardness of Linotype?
What is the Brinell Hardness of Linotype?
The Brinell Hardness of this Linotype alloy is about 22.
What is the hardness of lead bullets?
| Type Metal | Tin | Hardness |
|---|---|---|
| Lead | — | 5 |
| Tin | 100 | 7 |
| Antimony | — | 50 |
| As an example: the solidification of a nominally .357″ diameter bullet cast of Linotype could be expected from the above table to be .0065 X .357″ = .0025″. In a soft alloy of lead and tin, .01 X .357″ = .0035″. |
What is the composition of Linotype?
The Linotype alloy consists of 4% tin, 12% antimony and 84% lead; each bar measures approximately 8-3/4″ x 1″ x 2″ and weighs approximately 5 lbs (+/- .
What hardness is lead?
Harder pencil leads start with 2H, which is the equivalent of a Number 4 on the U.S. Numbering system, followed by the increasingly harder 3H, 4H and so on.
How much antimony is in a bullet?
Bullet Casting Alloy consists of 2% tin, 6% antimony and 92% lead – also known as “hardball” bullet casting alloy.
What BHN are wheel weights?
‘Stick on’ wheel weights are used on mag wheels where it is not possible to fit a traditional ‘clip on’ variety. As pure lead is taken to be ~ 5 BHN and ‘clip on’ wheel weight ~ 12 BHN (average from table 1.)
How hard should hard cast bullets be?
Hard cast bullets can be formulated of numerous alloy mixes (antimony, silver, tin, etc) containing some lead, but the alloys make the bullet much harder than pure lead. Most hard cast bullets will have a Brinell hardness # of 11 to 30 and as such are several times harder than lead.
What is the hardness of lead wheel weights?
As pure lead is taken to be ~ 5 BHN and ‘clip on’ wheel weight ~ 12 BHN (average from table 1.) we are left with a huge different in hardness and it is this factor of hardness which dictates the alloys ability to withstand pressure and velocity.
What temperature does Linotype melt at?
Melting Point-Solidus: 237 C, 459 F. Melting Point – Liquidus: 272 C, 522 F. Pouring Temperature: 340 C, 645 F.
How hard is lead on the hardness scale?
On the Mohs scale, a pencil “lead” (graphite) has a hardness of 1; a fingernail, 2.5; a copper penny, about 3.5; a knife blade, 5.5; window glass, 5.5; and a steel file, 6.5. Using these ordinary materials of known hardness can be a simple way to approximate the position of a mineral on the scale.
Which lead is harder B or HB?
The degree of graphite hardness is determined by the mix ratio of the graphite and clay, the greater the graphite the softer the lead and the more clay the harder the lead. Graphite pencils are classified as either soft black (B), hard (H), hard black (HB), and firm (F).
Does tin Harden lead?
Lead-tin alloys, for example, may re-crystallize immediately and completely at room temperature. Lead-silver alloys respond in the same manner within two weeks. In alloys of the lead-tin system, the initial hardening produced by alloying is quickly followed by softening as the coarse structure is formed.