WHAT IS CATEGORY AND STANDARDS OF PRESTRESSED STEEL STRANDS?

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1、Category

Steel strand is divided four categoriessuch as 2 wires、3 wires、 7 wires and 19wires.and divided five categoried such as bare steel strands、intended steel strands、compact steelstrands、galvanized steelstrands ,epoxy steel strands and etc.

2、Application Scope

Steel strands mainly used in construction,liftengineering,nuclear power engineering,fastening bar,inhaul cable and externalprestressed engineering.

3、 Standards

Differentcountries with different standards for prestressed steel strands,for example:Chinesestandard GB/T 5224、American standard ASTMA416、British standard BS5896 and Japanese standard JIS G3536、Australia standardAS/NZS 4672、Brazilian standardNBR-7483

4、1*7 1*7 structure steelstrands

4.1、 the changing process of size

Item	Steel rod OD (mm)	Single wire OD after drawing (mm)	Steel strands OD (mm)	OD tolerence (mm)
1	8	1.36	9.53	0.15~+0.30
2	9	1.58	11.1	0.15~+0.30
3	11	1.81	12.7	-0.15~+0.40
4	12.5	2.17	15.2	-0.15~+0.40
5	13	2.54	17.8	-0.15~+0.40
6	14	2.7	18.9	-0.15~+0.40
Formula of weight per meter：weight=density*volume，density（7.85g/cm³）

4.2、 Chemical Composition

Steel Grade	Chemical composition，Max,%
Steel Grade	C	Si	Mn	P	S	Cu
72A	0.70~0.75	0.12~0.32	0.30~0.60	0.025	0.025	0.20
72MnA	0.70`0.75	0.12~0.32	0.60~0.90	0.025	0.025	0.20
75A	0.73~0.78	0.12~0.32	0.30~0.60	0.025	0.025	0.20
75MnA	0.73~0.78	0.12~0.32	0.60~0.90	0.025	0.025	0.20
77A	0.75~0.80	0.12~0.32	0.30~0.60	0.025	0.025	0.20
77MnA	0.75~0.80	0.12~0.32	0.60~0.90	0.025	0.025	0.20
80A	0.78~0.83	0.12~0.32	0.30~0.60	0.025	0.025	0.20
80MnA	0.78~0.83	0.12~0.32	0.60~0.90	0.025	0.025	0.20
82A	0.80~0.85	0.12~0.32	0.30~0.60	0.025	0.025	0.20
82MnA	0.80~0.85	0.12~0.32	0.60~0.90	0.025	0.025	0.20
remark：add Cr、V、Nb and so on to be micro alloy steel to produce low relaxation prestressed steel strands