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The difference between three grade steel and two grade steel can be divided into the following aspects:1, different grades of steel (chemical composition is different). HRB335 grade steel is 20MnSi (20 manganese silicon); HRB400 grade steel bars are 20MnSiV or 20MnSiNb or 20MnTi etc.;2, strength is different, HRB335 grade steel tensile and compressive design strength is 300MPa, HRB400 grade steel tensile and compressive design strength is 360MPa.3, because of the chemical composition of steel and the ultimate strength of different, so in toughness, cold bending, fatigue and other properties are also different.s
The melting point of vanadium is very high, often with niobium, tantalum, tungsten, molybdenum, called refractory metal. Ductile, hard, without magnetism. Resistant to hydrochloric acid and sulfuric acid ability, and resistance to salt water corrosion performance than most stainless steel.s
Is the difference between the work and the theory of weight. General steel factory, have weight difference, unlike canned beverage, not so accurate, this is called "bad" or "inferior". But the mills are not stupid, only under the poor, is not Quejinshaoliang, with a significant difference (such as standard 100KG, he will give you a 110KG).s
It is recommended to use thread steel as far as possible, because the bonding force and holding force of the thread steel is better than that of the round steel, and it is generally known that the tensile pulling force of the round steel is relatively poor.s
Dowel arm for transverse construction joint. The transverse construction dowel bar is applied with a light circle and half coated with asphalt, allowing sliding. In practical application, the construction units are convenient for drawing, often use thread steel, and do not apply asphalt. The concrete pouring time on both sides of the construction joint is different, the contraction during the condensation process is not synchronous, and the dowel bar can not be stretched and formed a weak link. Cracks occur at this weak point when concrete slabs contract under loads or natural factors.s
The difference is that there are different ways of supplying. One is straight supply, the other is supplied by diskHalf of the price slightly lower than the straight, use less material processing to zero, but more a process.s