Flat Bar In I Type

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China Main Port
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TT or LC
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Supply Capability:
10000 m.t./month

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Product Description:

Specification of Spring Steel:

-Material: 70Si2CrA

-Production: Hot rolled or cold rolled

-Standard: GB/T·5218-1999

-Type: Spring Steel

-Alloy or no: Alloy



Chemical Composition:
















Mechanical Properties:

-Annealing Condition:

1, Tensile Strength: σb/MPa:≤835

2, Elongation: δ/%:≥8

-Quencher condition:

1, Tensile strength: σb/MPa:785~1175

2, Elongation: -


Packaging & Delivery

-Packing Detail: The products can be packed in bundles by steel wires.


1, Tag marks: the tag marks will be tied up to each bundle of the products. The information is usually including supplier’s logo and name, product name, made in China, products’ specifications, the painted color and other information requested by customers.

2, Color marks: we will paint both ends of the bundles of these products to make sure that they are more evident. It’s will be more convenient for the customers to distinguish them at the destination port.

-Delivery Detail:

1, Delivery time: 30~45 working days after receive buyer’s T.T. or L/C.

2, Delivery status should be written in the contract. (Heat treatment or no)



Widely used for construction, Machinery manufacturing, Iron tower steel structure, Shipbuilding; Steel grating, Staircase, Bridge, Viaduct, Railway spare parts, Boilers making etc.

Production Flow of Steel Flat Bar

The steel flat bar is made through three processes:

1.Feeding the material: Feeding the row material (the steel plate) to Slitting Line.

2.Slitting:The steel plate would be slitted into expected width by lengthways cutter.

3. Leveled and cutting: The plat bar would be ground into level by the grinder and then cut into required length.

Packaging & Delivery of Steel Flat Bar

Packaging Details: The Steel Flat Bars are packed in bundles and loaded in 20 feet/40 feet container, or shipped by bulk cargo ,also we can do as customer's requirements.

Delivery Details:30~45 days upon the receipt of buyer payment by T.T. or L/C.



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A2: We have established an advanced quality management system which conducts strict quality tests at every step, from raw materials to the final product. At the same time, we provide extensive follow-up service assurances as required.

Q3: What makes stainless steel stainless?

A3: Stainless steel must contain at least 10.5 % chromium. It is this element that reacts with the oxygen in the air to form a complex chrome-oxide surface layer that is invisible but strong enough to prevent further oxygen from "staining" (rusting) the surface. Higher levels of chromium and the addition of other alloying elements such as nickel and molybdenum enhance this surface layer and improve the corrosion resistance of the stainless material.


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Q:Lightning protection grounding, what is called three surface welding?
Lightning protection, grounding, the three sides of the welding:The buried depth of the grounding body shall not be less than 1m at the top, and the steel pipe grounding body shall be vertically configured.The length of the vertical grounding body shall not be less than 2.5m, and the spacing between them shall not be less than 5m.
Q:How can copper clad steel ground electrode and galvanized flat steel be welded?
If you want it to work well, use heat release welding, and if you take into account the cost budget, there are connectors, connectors that are just mechanical connections
Q:Where is the use of flat steel in electrical use?
Other equipment or cable bracket parts connected with bolts, flat width of less than 25mm with a 8mm bolt or two 6mm bolts. The width is less than 40mm by using two 10mm bolts, width 40-50mm uses two 12mm bolts, all bolts are galvanized, double single elastic gasket. In fact, all electrical components should be hot-dip galvanized (except welded steel pipe).
Q:What is the negative deviation allowed by the national standard for galvanized flat steel of 40*4?
40 is the width of the section steel, 4 is the thickness of the steel, and the unit is mm.Flat, refers to the width 12-300mm, thickness 4-60mm, cross section is rectangular in shape and with a blunt edge of steel. Flat steel can be finished steel, or can be used as the blank of welded pipe and thin slab for laminated sheet rolling.
Q:50*4 hot dip galvanized flat steel can be used as grounding. How many square feet can be used instead of ground wire?
GB is not 50*4, but 4*40; International Electrotechnical union IEC is 3*25 can also, and if it is small houses, GB only 6mm diameter of it. It can be seen that the size of flat steel is mainly due to the consideration of mechanical strength and more than the consideration of electrical performance
Q:Earthing flat steel and earthing main line
Grounding flat ground belongs to the material, the grounding line belongs to the grounding line, grounding flat steel used for grounding grid, the grounding line is also one of the flat ground, for connecting the grounding grid, the grounding grid extends to the metal shell of the substation ground of all electrical equipment, and the grounding grid connected together.
Q:The difference between use and performance of hot rolled flat steel and longitudinally cut flat steel is discussed
Its manufacturing process determines the poor dimensional accuracy of hot-rolled flat steel.Vertical shearing flat steel (fine shearing flat steel strip):The raw material board is produced by a larger factory, the raw material source is controllable, the material can be basically guaranteed, and the mechanical performance can basically meet the relevant GB standards.The dimension of vertical shear flat steel is relatively high.
Q:The steel, steel and flat steel, round steel bar and what is the difference?
In fact, for the processing of raw materials are the same, is used when the roller rolling pressure is not the same, there are many different types of tooth roller shaft, can produce different steel, the steel section is square, round cross section is round...
Q:How to use -40*4 galvanized steel bar to do grounding electrode?
Take 3 2.5m long 50 galvanized steel bars spaced 5m, buried in the ground 0.6m, and then galvanized flat steel and angle steel welding.
Q:Does the cable trench need grounding?
The cable trench needs grounding.

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