Varillas de alta resistencia D15 / D20

Name: Varillas de alta resistencia D15 / D20
Brand: Qianheng Fastener
Availability: InStock

Varillas para encofrado D15 y D20, grados 8.8 / 10.9, óxido negro o galvanizadas.

Directo de fábrica

CNC propio

Informes de lote

OEM según plano

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Varillas de alta resistencia D15 / D20

Produced on CNC thread-rolling lines for burr-free threads and consistent geometry. DW15 (15mm root / 17mm outer thread, 7.5mm pitch) carries approximately 150 kN allowable tension, while Rd20 reaches approximately 230 kN. Threads follow DIN 976, A193 B7 or GB/T 15389; materials range from Q235 to 45#, 40Cr and 20MnTiB with plain, electro-galvanized, hot-dip galvanized or Dacromet finishes.

Especificaciones

DW15 and Rd20 all-thread bars
D15 ≈150 kN / D20 ≈230 kN allowable tension
Length 200–9000mm, cut to length
Q235 / 45# / 40Cr / 20MnTiB
DIN 976 / A193 B7 / GB/T 15389 threads
Plain, electro-galvanized, HDG or Dacromet

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Especificaciones técnicas

Thread	DW15 (15mm root / 17mm OD, 7.5mm pitch); Rd20
Load Rating	~150 kN (D15) / ~230 kN (D20) allowable tension
Grades	4.8 / 8.8 / 10.9 per ISO 898-1
Material	Q235 / 45# / 40Cr / 20MnTiB
Length	200–9000mm, custom cut-to-length
Surface	Plain, electro-galvanized (8–25µm), HDG (45–85µm), painted, Dacromet
Packaging	Bundled on pallet, VCI wrap, seaworthy cartons

MaterialD15/D20: Q235 · 45# · 40Cr (selectable by load)

AcabadoPlain (black) · Electro-galvanized · Hot-dip galvanized · Dacromet

Carga nominalD15: 150 kN rated · D20: 230 kN rated (up to 430 kN on D25/D26.5 sets)

Peso unitarioD15: 1.5 kg/m · D20: 2.6 kg/m

EmbalajeBundled on pallet · VCI wrap · seaworthy cartons · marked per BOM

Proceso de producción

**Cutting & forming**Bar cutting, cold heading and plate forming to drawing dimensions.

**CNC thread rolling**Rolled threads for fatigue strength and consistent pitch diameter.

**Heat treatment**Quenching and tempering for class 8.8 and above, with process records.

**Surface treatment**Black oxide, zinc plating or hot-dip galvanizing to the specified thickness.

**Gauge & batch test**Thread gauging, hardness and tensile checks with batch test reports.

**Packing & marking**Set or BOM packing, VCI protection and seaworthy crates.

Grados de material explicados

Grado	Notas
Q235	Plain carbon steel. Economic option for light and medium formwork loads. Not heat treated.
45#	Medium carbon steel. The standard formwork tie rod grade in China; quenchable to class 8.8.
40Cr	Alloy steel. Higher hardenability and better fatigue performance than 45#; used where repeated reuse matters.
Class 10.9 bolt	Quenched and tempered alloy steel bolt used in the climbing cone set. Not electroplated without a documented baking cycle.
QT450-10	Ductile (nodular) iron with 450 MPa tensile and 10% elongation. Used for sleeves and embedded plates where toughness and castability matter.
HRB400	Hot-rolled ribbed bar (threaded steel) to Chinese standard. Used for embedded foot bolts; good bond with concrete.