Information on the most widely used ASTM standards within the materials testing industry
Model: GW-40C, ISO 6935-2
GW series rebar (steel bar) bending steel testing machine is a device for cold bending tests and surface root bending tests on steel.
This steel bending testing machine features compact structure, easy operation, large carrying capacity, smooth running, low noise, clear display of the bending angle and easy maintenance, to name just a few. It is an ideal device for steel plants and quality inspection units to test the bending and anti-bending performance of hot-rolled ribbed steel bars. It's conformed with ISO 15630-1, ISO 6935-2:1991, ASTM A370, ASTM A615, SLS 375 , BS 4449 standard.
General Introduction
GW series rebar (steel bar) bending steel testing machine is a device for cold bending tests and surface root bending tests on steel.
This steel bending testing machine features compact structure, easy operation, large carrying capacity, smooth running, low noise, clear display of the bending angle and easy maintenance, to name just a few. It is an ideal device for steel plants and quality inspection units to test the bending and anti-bending performance of hot-rolled ribbed steel bars. It's conformed with ISO 15630-1, ISO 6935-2:1991, ASTM A370, ASTM A615, SLS 375 , BS 4449 standard.

Key Features
1, This equipment features comprehensive performance, excellent quality, a compact structure with a small footprint, simple and easy operation.
2, Digital display for bending angles that is intuitive, smooth operation with low noise, reliable use with long service life.
3, Reasonable design, easy maintenance, and simple lubrication.
4, The equipment's limit has been changed to a mechanical limit switch, making it more convenient and durable.
5, The design of wear parts is more reasonable, and the cutting edges of wear parts are easy to replace.
6, In addition, the equipment has added an abnormal alarm function for the photoelectric switch controller, preventing equipment damage caused by system failure to stop when there is a problem with the proximity switch signal acquisition.
1. Sample Preparation
The sample must meet the length formula L=5d L₁ (d is the diameter of the rebar), with L₁≥150mm (for diameters ≤25mm) or ≥200mm (for diameters >25mm). The ends should be chamfered with a radius ≤0.5mm, and the surface roughness Ra ≤6.3μm.
2. Equipment Calibration
The bending testing machine should be calibrated quarterly, with emphasis on controlling the tolerance of roller spacing (±1%), punch corner radius deviation ≤0.02mm, and loading speed range (cold bending 1-5mm/s, hot bending 0.5-2mm/s).
3. Crack Determination
Surface defects are classified into three levels: macro cracks (visible to the naked eye and length >2mm), micro cracks (visible under 10x magnification), and surface wrinkles (depth <0.02mm is not counted as a defect).
ISO 15630-1,
ISO 6935-2:1991,
ASTM A370,
ASTM A615,
SLS 375 ,
BS 4449
Main Technical Specification
| Model | GW-40C |
| Bending test steel bar diameter | φ6~φ40mm |
| Forward bending angle | 0°-180° free setting |
| Reverse bending angle | 0°-90° free setting |
| Rotating speed of working plate | 1.4 r/min |
| Working table size | φ860mm |
| Roller center distance | 280mm |
| Motor power | 3 Kw |
Steel bar bending center standard accessories HRB400 | 4×Ф6、4×Ф8、4×Ф10、4×Ф12、4×Ф14、 4×Ф16、4×Ф18、4×Ф20、4×Ф22、4×Ф25、 5×Ф28、5×Ф32、5×Ф36、5×Ф40、6×Φ50A total set of fifteen pcs |
| Working roll | Φ52,Φ68 each one |
| Bending mandrel | Φ56 |
| Power supply | 380V, 50HZ, 3phase |
| Dimension | 1050×750×1200mm |
| Weight | 800Kg |
| Power | 3kw |
Optional Mandrel
| Can complete the bending performance test of steel bars (180°) HRB500 HRBF500 | 6×Ф6, 6×Ф8, 6×Ф10, 6×Ф12, 6×Ф14, 6×Ф16, 6×Ф18, 6×Ф20, 6×Ф22, 6×Ф25, 7×Ф28, 7×Ф32, 7×Ф36, 7×Ф40, 8×Φ50 A total set of fifteen pcs |
| Can complete the bending performance test of steel bars (180°) HRB600 HRBF600 | 6×Ф6, 6×Ф8, 6×Ф10, 6×Ф12, 6×Ф14, 6×Ф16, 6×Ф18, 6×Ф20, 6×Ф22, 6×Ф25, 7×Ф28, 7×Ф32, 7×Ф36, 7×Ф40, 8×Φ50 A total set of fifteen pcs |
| If the steel bar reverse bending performance test needs to be completed Order separately(positive bend 90°, reverse bend 20°) HRB400E HRBF400E | 5×Ф6, 5×Ф8, 5×Ф10, 5×Ф12, 5×Ф14, 5×Ф16, 5×Ф18, 5×Ф20, 5×Ф22, 5×Ф25, 6×Ф28, 6×Ф32, 6×Ф36, 6×Ф40, 7×Φ50 A total set of fifteen pcs |
| If the steel bar reverse bending performance test needs to be completed Order separately(positive bend 90°, reverse bend 20°) HRB500E HRBF500E | 7×Ф6, 7×Ф8, 7×Ф10, 7×Ф12, 7×Ф14, 7×Ф16, 7×Ф18, 7×Ф20, 7×Ф22, 7×Ф25, 8×Ф28, 8×Ф32, 8×Ф36, 8×Ф40, 9×Φ50 A total set of fifteen pcs |
Standard
ISO 7438 is a standard that specifies a method for determining the ability of metallic materials to undergo plastic deformation in bending. It is used to evaluate the flexural strength and stiffness of a material , The bend test shall be carried out in testing machines equipped with a bending device with two supports and a former; bending device with a V-block and a former; bending device with a clamp.
ASTM E290 Standard Test Methods for Bend Testing of Material for Ductility
ASTM E290 test methods cover bend testing for ductility of materials. Included in the procedures are four conditions of constraint on the bent portion of the specimen; a guided-bend test using a mandrel or plunger of defined dimensions to force the mid-length of the specimen between two supports separated by a defined space; a semi-guided bend test in which the specimen is bent, while in contact with a mandrel, through a specified angle of bend or to a specified inside radius of bend (r) measured while under the bending force; a free-bend test in which the ends of the specimen are brought toward each other, but in which no transverse force is applied to the bend itself and there is no contact of the concave inside surface of the bend with other material; a bend-and-flatten test, in which a transverse force is applied to the bend such that the legs make contact with each other over the length of the specimen.
ASTM A370 Standard Test Methods and Definitions for Mechanical Testing of Steel Products
ASTM A370 test methods cover procedures and definitions for the mechanical testing of steels, stainless steels, and related alloys. The various mechanical tests herein described are used to determine properties required in the product specifications. Variations in testing methods are to be avoided, and standard methods of testing are to be followed to obtain reproducible and comparable results. In those cases in which the testing requirements for certain products are unique or at variance with these general procedures, the product specification testing requirements shall control.
Covering tests like Tension, Bend, Hardness, Brinell, Rockwell, Portable, and Impact, each catering to distinct aspects of mechanical property assessment. Moreover, it accommodates annexes for specific product types, including Bar Products, Tubular Products, Fasteners, Round Wire Products, and more, ensuring a holistic approach to testing.
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