ZBG0301 carbon steel Q195 ZBG0311 carbon steel Q215A ZBG0321 alloy steel 20MnSiNb ZBG0761 carbon steel 20 # ZBG0771 carbon steel 45 # ZBG0781 alloy steel 37Mn5 ZBG0791 alloy steel 20Mn2 ZBG0801 alloy steel B2 ZBG0811 alloy steel 30CrMnTi ZBG0821 alloy steel 20CrMo ZBG0831 alloy steel 45MnV ZBG0841 alloy steel 27SiMn ZBG0851 carbon steel 65Mn ZBG0861 alloy steel 30Mn2

This standard substance is applicable for calibrating instruments, evaluating testing methods, and unifying testing values during product quality inspection of carbon steel and alloy steel materials. It can also be used for production control, finished product analysis, quality supervision, etc. of such products.

1、 Preparation method: material selection → vacuum furnace smelting → ingot casting（ Φ 120mm) → demolding → initial inspection of ingots → rolling into Φ 50mm round steel → initial uniformity inspection → vehicle

Leather → car debris (12-18r/min) → mixing and screening → sampling uniformity inspection → constant value analysis → mathematical statistics → constant value

4、 Uniformity inspection and stability inspection

Using the variance (F) test method, the result showed that sulfur F was 0.3 g; Silicon, chromium, and nickel 0.1 g; Manganese, phosphorus, molybdenum, copper, titanium, aluminum, vanadium, tungsten, cobalt 0.2 g. After investigation, the standard substance is stable

Good performance, valid for 15 years.

Multiple laboratories are used for collaborative calibration, with most calibration units being qualified nationally recognized units or units with years of experience in developing or measuring standard substances. All instruments used in each laboratory have passed metrological verification, and the reference materials or standard solutions used are either confirmed purity reference materials or certified standard solutions approved and published by the country. Accurate and reliable testing methods using different principles, such as C using infrared absorption and combustion gas capacity method, Si using inductively coupled plasma atomic emission spectroscopy, silicon molybdenum blue spectrophotometry, and perchloric acid dehydration weight method, Ti using diantipyrylmethane spectrophotometry, copper iron reagent separation hydrogen peroxide spectrophotometry, and inductively coupled plasma atomic emission spectroscopy

The method is used for testing, and all tests are carried out with national first level standard substances that have been approved and published by the country.

Bottled, net weight 100g, sealed with aluminum film. After weighing the sample, tighten the bottle cap and store it in a dry place to prevent oxidation.