ACROSS the sea I heard the groans Of nations in the intervals Of wind and wave. Their blood and bones Cried out in torture, crushed by thrones, And sucked by priestly cannibals. I dreamed of Freedom slowly gained By martyr meekness, patien... Read more of Italy at Martin Luther King.caInformational Site Network Informational
Privacy
   Home - Steel Making - Categories - Manufacturing and the Economy of Machinery

Steel Making

The Electric Process
The fourth method of manufacturing steel is by the electric f...

Preparing Parts For Local Case-hardening
At the works of the Dayton Engineering Laboratories Company, ...

Sulphur
SULPHUR is another element (symbol S) which is always found i...

Quenching The Work
In some operations case-hardened work is quenched from the bo...

Preventing Cracks In Hardening
The blacksmith in the small shop, where equipment is usually ...

Temperatures To Use
As soon as the temperature of the steel reaches 100 deg.C. (...

Blending The Compound
Essentially, this consists of the sturdy, power-driven separa...

Piston Pin
The piston pin on an aviation engine must possess maximum res...

Standard Analysis
The selection of a standard analysis by the manufacturer is t...

Cutting-off Steel From Bar
To cut a piece from an annealed bar, cut off with a hack saw,...

Heat Treatment Of Punches And Dies Shears Taps Etc
HEATING.--The degree to which tools of the above classes shou...

Critical Points
One of the most important means of investigating the properti...

Corrosion
This steel like any other steel when distorted by cold worki...

Case-hardening Treatments For Various Steels
Plain water, salt water and linseed oil are the three most co...

For Milling Cutters And Formed Tools
FORGING.--Forge as before.--ANNEALING.--Place the steel in a ...

Tool Or Crucible Steel
Crucible steel can be annealed either in muffled furnace or b...

Sulphur
Sulphur is another impurity and high sulphur is even a greate...

The Penetration Of Carbon
Carburized mild steel is used to a great extent in the manufa...

The Forging Of Steel
So much depends upon the forging of steel that this operation...

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...



Properties Of Steel






Category: COMPOSITION AND PROPERTIES OF STEEL

Steels are known by certain tests. Early tests were more or less
crude, and depended upon the ability of the workman to judge the
grain exhibited by a freshly broken piece of steel. The cold-bend
test was also very useful--a small bar was bent flat upon itself,
and the stretched fibers examined for any sign of break. Harder
stiff steels were supported at the ends and the amount of central
load they would support before fracture, or the amount of permanent
set they would acquire at a given load noted. Files were also used
to test the hardness of very hard steel.

These tests are still used to a considerable extent, especially in
works where the progress of an operation can be kept under close
watch in this way, the product being periodically examined by more
precise methods. The chief furnace-man, or melter, in a steel
plant, judges the course of the refining process by casting small
test ingots from time to time, breaking them and examining the
fracture. Cutlery manufacturers use the bend test to judge the
temper of blades. File testing of case-hardened parts is very common.

However there is need of standardized methods which depend less
upon the individual skill of the operator, and which will yield
results comparable to others made by different men at different
places and on different steels. Hence has grown up the art of testing
materials.





Next: Tensile Properties

Previous: Alloying Elements



Add to del.icio.us Add to Reddit Add to Digg Add to Del.icio.us Add to Google Add to Twitter Add to Stumble Upon
Add to Informational Site Network
Report
Privacy
SHAREADD TO EBOOK


Viewed 4267