Precision rolled threaded steel

Threaded steel bars for prestressed concrete (also called precision rolled threaded steel) are large-diameter, high-strength, high-dimensional precision straight bars with discontinuous external threads rolled on the entire steel bar. The steel bar can be connected with a connector with an internal thread or anchored with a threaded nut at any cross section.

Brief introduction:

Precision rolled threaded steel are further rolled by a high-precision rolling mill on the basis of hot-rolled ribbed steel bars. They have fine-rolled threads on their surface and can be closely matched with anchors, connectors, etc. They are mainly used for prestressed construction of large concrete structures. Prestress is applied by tensioning, and the elastic retraction of the steel bars is used to generate pre-compressive stress on the concrete, thereby improving the crack resistance, durability and bearing capacity of the concrete structure.

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ADVANTAGES

Characteristics of precision rolled threaded steel:

High strength: high yield strength and tensile strength, stable and reliable quality. Common strength grades include PSB785, PSB830, PSB930, PSB1080, etc., which can meet the needs of different large-scale projects.
High precision: high dimensional accuracy, uniform thread specifications, regular tooth shape, ensuring the reliability and construction accuracy of connection with anchors.
Good machinability: good cold bending and welding performance, convenient for cutting, bending and connection at the construction site. Save steel bars, reduce component area and weight.
Strong adaptability of connection method: simple connection and anchoring, strong adhesion, safe and reliable tension anchoring, and convenient construction.
High corrosion resistance: generally surface anti-corrosion treatment is carried out, such as galvanizing, plastic coating, etc., which can effectively resist external environmental erosion and extend service life.

USE

Specifications of precision rolled threaded steel:

Prestressed concrete rebar is divided into grades according to yield strength, and its code is "PSB" plus the specified minimum yield strength. P, S, and B are the first letters of Prestressing, Screw, and Bars, respectively. For example: PSB830 represents a steel bar with a minimum yield strength of 830 MPa.

PSB500, PSB785, PSB830, PSB930, PSB1200, PSB1080/15mm, 20mm, 25mm, 28mm, 32mm, 36mm, 40mm, 50mm, 75mm and other specifications of precision rolled threaded steel.

Product parameter:

Product Parameters
Nominal Diameter / mm	Level	Nominal cross-sectional area / mm²	Theoretical weight kg/m
Φ15	PSB830	177	1.4
Φ20	PSB500	314	2.47
Φ25	PSB500 / 830 / 930 / 1080	491	4.1
Φ32	PSB830 / 930 / 1080	804	6.65
Φ36	PSB830 / 930 / 1080	1080	8.41
Φ40	PSB830 / 930 / 1080	1257	10.34
Φ50	PSB830 / 930 / 1080	1963	16.28

Mechanical properties table:

Level	Yield Strength /Mpa	Tensile Strength /Mpa	Elongation after Fracture A/%		Total elongation at maximum force A/%	Stress Relaxation Properties
						Initial Stress	Stress relaxation rate after 1000h /%
	Not less than
PSB785	785	980		7	3.5	0.8R	≤3
PSB830	830	1030		6
PSB930	930	1080		6
PSB1080	1080	1230		6
Note: When there is no obvious yield, the specified non-proportional elongation strength is used instead.

Implementation standards:

The implementation standards for finished rolled rebar are mainly based on GB/T20065-2016, which specifies in detail the category and definition, strength grade, size and shape and allowable deviation, technical requirements, test methods, inspection rules, packaging marks and quality certification of finished rolled rebar. The marking of steel bars shall comply with the following provisions: The end shall be painted according to the strength level, as follows: PSB785 is not painted, PSB830 is painted white, PSB930 is painted yellow, and PSB1080 is painted red.

Precision rolled threaded steel

SPECIFICATIONS

Specifications:

Diameter /mm	dh/mm		dv/mm		h/mm		b/mm		l/mm		r/mm	α
Diameter /mm	Size	Tolerance	Size	Tolerance	Size	Tolerance	Size	Tolerance	Size	Tolerance	r/mm	α
15	14.7	±0.2	14.4	±0.5	1.0	±0.2	4.2	±0.3	10.0	±0.2	0.5	78.5º
20	20.0	±0.4	20.0	+0.4-0.8	1.3	±0.3	4.8	±0.5	10.0		1.2	80.5º
25	25.0	±0.4	25.0	+0.4-0.8	1.6	±0.3	6.0		12.0		1.5	81º
32	32.0	±0.5	32.0	+0.5-1.2	2.0	±0.4	7.0		16.0		2.0	81.5º
36	36.0		36.0		2.2	±0.4	8.0		18.0	±0.3	2.5	81.5º
40	40.0		40.0		2.5	±0.5	8.0		20.0		2.5	81.5º
50	50.0		50.0		3.0	-0.5	9.0		24.0		2.5	81.8º

Mechanical Properties：

Mechanical Properties
Diameter / mm	Cross-sectional area / mm	Weight Kg/m	PSB830				PSB930				PSB1080
			Min Yield Stress/Load		Min Ultimate Stress/Load		Min Yield Stress/Load		Min Ultimate Stress/Load		Min Yield Stress/Load		Min Ultimate Stress/Load
			Mpa	KN	Mpa	KN	Mpa	KN	Mpa	KN	Mpa	KN	Mpa	KN
15	177	1.4	830	147	1030	182	930	165	1080	191	1080	191	1230	218
20	314	2.47	830	261	1030	323	930	292	1080	339	1080	339	1230	386
25	491	4.1	830	408	1030	506	930	457	1080	530	1080	530	1230	604
32	804	6.65	830	667	1030	828	930	748	1080	868	1080	868	1230	989
36	1018	8.41	830	845	1030	1049	930	947	1080	1099	1080	1099	1230	1252
40	1257	10.34	830	1043	1030	1295	930	1169	1080	1358	1080	1358	1230	1546
50	1963	16.28	830	1629	1030	2022	930	1826	1080	2120	1080	2120	1230	2414
Elongation at fracture A / %			≥7				≥7				≥6
Total Elongation at max force Agt / %			≥3.5
Relaxation at 1000h			≤4
Modulus of elasticity / Mpa			2 x 10⁵

Core advantages of the precision rolled threaded steel:

Precision rolled threaded steel can be directly matched with special nuts for anchoring, without welding or threading, and has a tensile strength of 835MPa~1230MPa, which is more than 30% higher than ordinary rebar (HRB500 grade about 630MPa), and is suitable for lifeline projects that require long-term stable load-bearing or dynamic loads.

Precision rolled threaded steel

PACKAGE

Box pcakaging or as customers' requirements.

TAGS: Threaded steel bars for prestressed concrete, Precision rolled threaded steel