What does round steel GB3098 1 82 mean

This is the type and national standard of steel.

Round steel is a cylindrical steel bar, GB is the initial letter of the national standard, is the standard number, 82 is the age (version) number, is the fastener mechanical performance standard. The landlord's writing may be that the mechanical properties of fasteners made of round steel rods are checked.

Round steel refers to a solid strip of steel with a circular cross-section. Its specifications are expressed in diameter, in millimeters (mm), such as "50mm" means a round bar with a diameter of 50 mm.

There are three types of round bars: hot-rolled, forged and cold-drawn. Hot-rolled round bars are measured in millimeters. Where:

Most of the small round steel of millimeters is bundled with straight bars, which are often used as steel bars, bolts and various mechanical parts; Round steel larger than 25 mm is mainly used for the manufacture of mechanical parts, pipe blanks for seamless steel pipes, etc.

Round steel refers to a solid strip of steel with a circular cross-section, and GB indicates that the material is produced according to national standards, indicating the national standard document number.

Summary. Hello dear, here is a string of material markers with the following information: round bar:

Refers to a steel product that is cylindrical in shape. 15-GB905-82: 15 refers to the mass percentage of the carbon content of the steel, and GB905-82 is the standard number, indicating that the steel meets the requirements of the national standard GB905-82.

GB905-82 is a standard for die steel, which stipulates the classification, marking, technical requirements, test methods, inspection rules and markings, packaging, storage and other contents of die steel.

Round Bar 15-GB905-82-||30crmnsia-gb/t3077-1999-||Stage Marker Mass Ratio -||

Hello dear, this is a string of material markers, which contains the following information: round bar: refers to a steel product, cylindrical in shape.

15-GB905-82:15 refers to the mass percentage of the carbon content of the steel track, and GB905-82 is the standard number, indicating that the steel meets the requirements of the national standard GB905-82. GB905-82 is a standard for die steel, which stipulates the classification, marking, technical requirements, test methods, inspection rules and marks, grinding packaging, storage and other contents of die steel.

30CrMnsia-GB T3077-1999: 30Crmnsia indicates the grade of the steel, and GB T3077-1999 is the standard number, indicating that the steel meets the requirements of the national standard GB T3077-1999. GB T3077-1999 is a standard ruler key for alloy structural steel, which stipulates the classification, marking, technical requirements, test methods, inspection rules and markings, packaging, storage and other contents of alloy structural steel.

Stage mark: refers to the production stage of the steel, indicating which Shengling Zen production process the steel has passed. Quality:

It refers to the quality grade of the steel, indicating whether the steel is qualified in the production and quality inspection process. Proportion: refers to the proportion of the composition of the steel, indicating the proportion of the content of various chemical elements in the steel.

To sum up, this mark contains the basic information, standards, grades, compositions, production processes and other contents of steel, and is an important symbol in the production and use of steel.

Differences: First, the content of the regulations is different.

1. GB stipulates the terms and definitions, classification, grade, order content, size, shape, weight and allowable deviation, technical requirements, test methods, inspection rules, packaging, marking and quality certificate M of hot-rolled round steel bars for reinforced concrete.

2. GB T 701-2008 stipulates the order content, size, shape, weight and allowable deviation, technical requirements, test methods, inspection rules and packaging, marks and quality certificates of low-carbon steel hot-rolled rods.

Second, the nature is different.

1. GB is a mandatory national standard in China.

2. GB T 701-1997 is a recommended national standard in China.

3. The scope of application is different.

1. GB is suitable for steel for reinforced concrete.

2. GB T 701-2008 is suitable for low-carbon steel hot-rolled round rods.

First of all, to correct a little, there is no GB T, a recommended national standard, which is not enforced), only GB.

Here's a quick rundown:

GB "Steel for Reinforced Concrete Part 1: Hot-rolled Round Steel Bar" is a mandatory national standard in China.

Corresponding to the international standard ISO 6935-1:1991 "Steel for reinforced concrete – Part 1: Round steel bars".

In fact, the 2008 version of GB in China is slightly larger than the 1991 version of ISO 6935-1, because it also refers to the 2005 version of ISO 6935-1. It therefore corresponds to ISO 6935-1:1991, but is not fully equivalent).

gb/t 701-2008

Low-carbon steel hot-rolled rod is a recommended national standard in China, which is adopted by enterprises according to different situations.

Corresponds to the English version of the Japanese standard JIS G 3505:2004 "Mild Steel Wire Rod". (Due to different national conditions, the content of this standard is not completely equivalent to that of this Japanese standard, and some contents have been technically modified).

If we want to talk about the difference between these two standards, it can be seen from the name that the scope of application is different.

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I don't know how these two standards work, I only found one, I don't know if it can help you with the standard number: GB

Standard Name: Steel for Reinforced Concrete Part 1: Standard Condition of Hot Rolled Round Steel Bars: Current.

30408 round steel implementation standard: S30408 (that is, the numerical code of 06CR19NI10) material implementation GB T 20878-2007 this standard. To a certain extent, it can be determined that this is one of the most widely used chromium-nickel stainless steels, with good corrosion resistance, heat resistance, low-temperature strength and mechanical properties.

1. Corrosion-resistant in the atmosphere, if it is an industrial atmosphere or a heavily polluted area, it needs to be cleaned in time to avoid corrosion. 2. It is suitable for food processing, storage and transportation, and the allowable temperature range is: -196 800.

3. It has good processing performance and weldability, such as plate heat exchanger, bellows, household goods, building materials, chemicals, food industry, etc. Extended MaterialS30408 Chemical Composition: Carbon %:

Silicon %: Manganese %: Phosphorus %:

Sulfur %: Nickel %:; Chromium %:.

Ferritic phase formation: an effect on the properties of austenitic stainless steels. The appearance of the F phase generally has a negative effect on the properties of austenitic stainless steels

For example, the tendency of cracks caused by hot processing increases; Reduced pitting resistance of steel and deterioration of corrosion resistance in many corrosive environments such as urea production; When heated at high temperatures for a long time, the F phase will transform into a phase, making the steel brittle and so on.