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Level 1 Steel bar, level 2 steel bar, level 3 steel bar introduction.
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Level 1 Steel bar, level 2 steel bar, level 3 steel bar introduction.
Level 1 Steel bar, level 2 steel bar, level 3 steel bar introduction.
ClassificationWater and electricity construction industry
Release date2015-10-12
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Content
 
Introduction



Level 1 Steel bar, level 2 steel bar, level 3 steel bar are distinguished by the mechanical property.


Due to the different chemical composition of steel, reinforced resilience will be different. Grade steel is different, its yield strength, ultimate strength, elongation, cold-formed and weldability are very different, the use of different levels of rebar also has a great location along. 


Therefore, accordance to the needs of social production development, China nation create the mechanical properties of standard materials.

A reinforcement yield strength 235MPa tensile strength: 370Mpa Elongation 25%

Two steel yield strength 335MPa tensile strength: 445Mpa Elongation 17%

Three steel yield strength 400MPa tensile strength: 540Mpa Elongation 16%

Four steel yield strength 540MPa tensile strength: 630Mpa Elongation 15%


Tensile strength P = F / Size S

According to regulations, diameter steel 28-40, the rear elongation can be reduced by 1%, more than 40 steel can be reduced by 2%. The above requirements is the minimum guaranteed delivery inspection.

2, according to the difference between steel shape rating:


Q235 (HRB235) a smooth steel is not threaded circular cross-section, the supply in the form of a disk round and round, diameter 6--10mm, length of 6m ~ 12m.

HRB335 are two steel: General , grade steel rolling herringbone

HRB400 are three steel: Usually , grade steel rolling herringbone

HRB500 four steel is rolled into a spiral and crescent.


 

                   Level 1 round bar  1



        Level 1 round steel material coil 2


 


                Thread reinforcing bars  3



                    4



                Crescent-shaped thread 5



               Level 4 steel bar 6


3. What is the steel tensile strength, yield strength of the steel bar?

 

Tensile strength (ultimate strength) is the material tensile test maximum tension before breaking.


Yield strength (yield strength) is generating tension suffered material yielding when.


In short reaction yield strength of the material deformation resistance; tensile reaction material to resist destructive capacity stretched.


The higher the yield, the higher tensile strength, (yield strength less than the tensile strength alloy steel) but also by a number of methods can substantially altering the tensile strength compared with the same time to a significant reduction in the yield strength.


1)British Standard: BS4449:2005
Steel Grade: 460B 500B



Diameter 
Dia(mm)

6.0
8.010121416182022252832

Theoretical Weight
(kg/m)

0.222
0.3950.6170.8881.211.582.02.472.983.854.836.31


2)ASTM Standard: ASTM A615/A 615M-09
Steel Grade: GR40 GR60


Bar Designation No.345678910

Diameter Dia(In)

3/8''
1/2''5/8''3/4''7/8''1''1-1/8''1-1/4''

Diameter Dia(mm)

9.5
12.715.919.122.225.428.732.3

Theoretical Weight
(kg/m)

0.560
0.9941.5522.2353.0423.9735.0606.404


3)Standard:  JIS G3112:2010  KS D 3504
Steel Grade: SD390 SD490 SD400 SD500


Bar Designatio No.D10D13D16D19D22D25D29D32

Diameter Dia(mm)

9.53
12.715.919.122.225.428.631.8

Theoretical Weight
(kg/m)

0.560
0.9951.562.253.043.985.046.23




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