First of all, the quality of the steel gratings is visually distinguished. The steel gratings are made of Q235 low-carbon steel. The production of steel gratings is in accordance with the standard of steel grating quality standards YB/T4001-2007 and hot-rolled flat steel GB704-88. Hot-dip galvanizing implements the GB13912-92 standard.

How to distinguish the quality of the steel grating from the appearance can be carried out from the following aspects:

1. Whether the grid is regular is generally rectangular (rectangle).

2. Whether the solder joint is fully soldered and firm. If you are hand-welding steel grids, you need to pay special attention.

3. Whether the margin of the twisted square steel (Twisted steel) on the edge of the pressure welding can be parallel with the flat steel on the edging side.

4. Whether the treatment of zinc slag and welding slag is clean.

5. Conditionally measure the zinc layer thickness with a zinc layer thickness gauge. Cold galvanized steel has almost no thickness, hot galvanized steel can reach 70uf or more;

6. The surface of the hot-dip galvanized steel grating is grayish-white, while the cold-galvanized one looks brighter. In some places, there may be leaching.

After analyzing the above points, there will be a reference for the preliminary discrimination of the quality of steel gratings.

Second, ask how much weight is the manufacturer's steel grating? Weight is the standard for measuring the price of steel gratings. The low price of steel grating products is generally due to the large error in flat steel thickness. (The steel grid flat steel that is often purchased is 5mm thick, which is 5mm. Produced 4.6mm and even more outrageous only 4.2mm, here you can see the allowable deviation of the size of the steel grating panel). The use of steel gratings with sub-thicknesses will be a safety hazard in places where heavy loads are required.

Pressure Test Box

Pressure test box

The pressure test box, composed of pressure hose, pressure tap and Pressure Gauge, is used for the pressure testing of the hydraulic system. It is has simple use and good portability. The pressure hose is used for the the pressure testing of the hydraulic system under the operating pressure of 630BAR and burst pressure of1600BAR, temperature-30~+100℃. It can read the pressure value directly with connection to the pressure gauge. It is wildly used in the military, mining, ship, oil and chemical industry.

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