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PC strand or is called prestressed concreted strand, is widely use for construction industry. Meanwhile, according to its type, PC steel strand, as most popular and applications of wide-range, should be high tension low relaxation pre-stressed concrete strand. So why it is so different from other types of pc strand steel? Let us have a look and comprehend about its advantages, process and finishes below,


Types of steel strands

Normally we consider prestressing concrete strand wire as simple and boring products. However in this industry, insiders may divide steel strand (steel wire rope) into many types in accordance with its materials’ characteristics, structure itself, surface coating and so on. Well, let us know complete classification information:

  • Coating of steel strand

We may sort PC strand as smooth steel strand, mold pulling strand, coated epoxy resin steel strand, plastic coating wire rope, copper coating steel wire ropes etc.

  • Structures of steel strand

Sometimes, you may hear of 2 wires, 7 wires or even 19 wires steel strand. Actually insiders classify the steel wire rope according to its structure, meanwhile, the common used structure should be 7 wires.

  • Materials of steel wire ropes

Often we also know it as aluminum coating steel strand, stainless steel strand and common carbon steel strand.

  • Use of steel wire rope

Now we may consider about pc strand, stainless steel strand and zinc coated steel strand (for electric power), etc.

Low relaxation PC strand V.S Normal relaxation PC strand

Now, let us discuss about low relaxation prestressed concrete strand and normal relaxation pc steel strand. So why the most of application choose the first type, namely low relaxation pc strand? We may know the reason after comparing the difference between LRPC strand and NRPC strand.

At the first, the strength loss of low relaxation pc strand is smaller than stress-relieved pc strand’s after post-tensioning test.

The second, these two types of pc strand own different quality, low-relaxation prestressed steel strand is much better than stress-relieved PC strands.

The third, when working during high temperature environment, its elasticity and fastening effects are totally different between low-relaxation strand and normal-relaxation strands. Former is really much better than normal relaxation strand steel.

Application of low relaxation PC strand

Low-relaxation steel PC strands we manufactured, are suitable for long-span prestressed and post-tensioned concrete construction according to its excellent advantages. Its final applications include bridges build, viaducts, multi-storey concrete buildings, such as shopping malls, parking lots or houses.


Certainly, another wide use of low relaxation strand is for mining. Quality LR steel pc strands we manufactured, already have exported to worldwide and widely used for mining industry with good comments from buyers.

Contact Us

Scientific Research Office Bldg No.5 Jinghai Road. Jinghai Economic Development Zone, Tianjin, China.

Company Details

Hayes Trade Co.,Ltd. is a reputable Chinese supplier of prestressed concrete (PC) wire strand. Our seven fully modernized state-of-the-art production lines annually output 270,000 tons of PC wire and PC strand of various standards, lengths, gauge sizes, and surface types. We have also developed a responsive global distribution system that warrants the best just-in-time (JIT) manufacturing for our past and future customers across the globe.
Tianjin Hayes Trade Co., Ltd.