Specification of Steel

 

Types of Steel

 Generally the steel is of two types mentioned below.  

  • Structural steel
  • Mild steel and medium tensile steel bars for concrete reinforcement.

Structural Steel:

This specification covers steel sections, plates and bars of the following categories for use in structural work:-   

Quality of Finished Structural steel

All finished steel subject to tolerances should be fine and rolled cleanly to the dimension, sections and weights specified. The finished material should be free from cracks, surface flaw lamination rough, jagged and imperfect edges and all other defects. The material should comply in all respects with the test and requirements mentioned in INDIAN standard 226, applicable to the material (Members, sections, plates and bars.) specified or required.

   

Structure Steel

(This Picture is Contributed by "Gungya")

 S.No

 Steel Designation

 Purpose for which intended

 1.  A In structures subject to dynamic loading and other special cases.           
 2.  B In structures not subject to dynamic loading.
 3. C In structures subject to dynamic loading and when special  welding jobs are involved.

The following varieties of steel should be used for structural purposes.

  • S.T 42-S: The standard quality steel designated as ST-42, confirming to IS: 226 should be used for all types of structures (riveted or bolted) including those subject to dynamic loading and where fatigue, wide fluctuation of stress and reversal of stress are involved, as for example: - Girders, Crane Gantry, road and railway bridges etc. It is also suitable for welding up to 200 mm thick material.
  • S.T 42-W: The fusion welding quality steel designated as ST 42 W confirming to IS: 2062 is used for the structures subject to dynamic loading.           
  • S.T 42-O: The ordinary quality steel designated as ST 42-O confirming to IS: 1977 is used for the structures not subject to dynamic loading, other than wind load where welding is not used.
  • S.T 32-O: This ordinary quality of steel designated as ST 32-O confirming to IS: 1977 is used for door window frames, grills, steel gates, building hardware fencing etc.


Mild steel and medium tensile steel bars for concrete reinforcement

 The specification covers requirement and methods of the test for rolled mild steel and medium tensile steel bars in round and square sections.

TMT Steel bar

(This Picture is Contributed by "Arjun")

Tolerance of medium tensile steel for Construction Work

The bars should be rolled up to following tolerances.

 S. No.    Diameter of Bar(mm)  Total Tolerances(mm)
 1.  19 and below  0.4
 2.  20 and 21  0.45
 3.  22,23 and 24  0.5
 4.  25 and over

 2% of dia.

Quality of Finished medium tensile steel:

The following points ensure the quality of finished steel for construction work.

  • All finished steel should be fine and rolled cleanly to the dimension and should have weight as specified by BIS subject to permissible tolerance.  
  • The finished material should be free from cracks, surface flaws laminations, rough and imperfect edges and other harmful defects. 
  •  Steel section should be free from excessive rust, scaling and tilting and be well protected.  
     

Pipes made of mild steel

(This Picture is Contributed by "Gungya")

Manufacturing of steel:

All type of steel should be manufactured by open hearth, electric, duplex or by acid Bessemer process or by a combination of the processes.
 

 
11  Comment(s)
Anonymous
By Anonymous - On 9/24/2012 8:42:04 PM
you have to include some more detials to it
 
Anonymous
By Anonymous - On 9/23/2011 10:49:48 AM
What type of steel rod at either 1/2" or 5/8" by 36 " long would be the hardest to bend.
 
dhanaraj
By dhanaraj -  On  7/29/2011 2:24:10 PM
I want to construct Gr. 400Sft + 3 Floors of 900 sft each. what is size of steel to be used for columns and beam and roofs.
 
Anonymous
By Anonymous - On 7/23/2011 12:00:27 AM
Good
 
S L Gupta (Civil Engg)
By S L Gupta (Civil Engg) -  On  1/27/2011 5:34:36 PM
Dear Mehboob
It is better if you construct your house yourself because you can arrange good quality construction materials which are not possible when you go through contractor on material basis. If you feel labor problem than go ahead on labor rate basis in which all materials are to be arranged by you. In the web site GharExpert .com the link is given below:
Tips to Hiring a Contractor
Top 10 Mistakes when Hiring a Contractor

 
MEHBOOB
By MEHBOOB -  On  12/29/2010 12:48:24 AM
should one construct his own house or get it constructed through a contractor
 
Anonymous
By Anonymous - On 7/21/2010 3:47:55 PM
It should be more informative. One should provide the informations so that a common costumer may check the quality before buying it.
 
Anonymous
By Anonymous - On 7/19/2010 2:45:50 PM
pleas let me know which type of welding elctrode use for A e250steel struture
?
 
Anonymous
By Anonymous - On 1/18/2010 12:37:44 PM
plese let me know which steel is supposed to be used for conduits,is 9537part-2
 
Shabbir Manzoor
By Shabbir Manzoor -  On  10/26/2009 2:05:50 PM
Excellant site
 
Anonymous
By Anonymous - On 5/9/2009 4:04:50 PM
how weights of Nominal Bore pipes can be calculated?
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