The most popular secondary and tertiary deformed s

2022-08-06
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In February this year, the "abnormal" phenomenon that "the market price of grade III deformed steel bar is the same as that of grade II deformed steel bar, or even lower" occurred again in Beijing and other steel cities. In response, in the price policy issued by Hebei Iron and Steel Group (hereinafter referred to as Hegang) at the end of February, The price difference between grade III deformed steel bar (HRB400) and grade II deformed steel bar (HRB335) is correspondingly reduced to 50 yuan/ton. Insiders pointed out that the deep-seated problem reflected in this "abnormal" situation is that there is still a certain demand space in the current steel market for the secondary deformed steel bars that many ministries and commissions have repeatedly issued documents to eliminate, while there is no small difficulty in the promotion of high-strength steel bars such as tertiary deformed steel bars

the price difference of grade II and III deformed steel bars was "abnormal" at different stages.

at the end of last month, Hebei Iron and Steel Co., Ltd. successively issued the "settlement price policy for construction steel in February" and the "guiding price policy for construction steel in early March". Surprisingly, the general production cost is RMB yuan higher than that of grade II deformed steel bars/there are many tons of grade III deformed steel bars with closed holes in these materials. In the above two price policies of Hegang, it is only 50 yuan/ton higher than that of grade II deformed steel bars

according to the settlement price policy and guiding price policy of construction steel issued by hecang last year, the price difference between grade III deformed steel bar and grade II deformed steel bar is more than 100 yuan/ton in most cases. The "abnormal" price difference of 50 yuan/ton only occurred briefly in the settlement price policy in February and March last year and the guiding price policy in July

corresponding to the "abnormal" price policy of Hebei Iron and Steel Group Co., Ltd., in the steel markets such as Beijing within the sales scope of Hebei Iron and Steel Group Co., Ltd., there has been an "abnormal" phenomenon that "the market price of grade III deformed steel bar is the same as that of grade II deformed steel bar, or even lower"

generally, the cost of grade III deformed steel bars produced by steel plants is about yuan/ton higher than that of grade II deformed steel bars, and the market price difference of grade II and III deformed steel bars of the same specification in the same steel plant is generally between yuan/ton

"my steel" analysts pointed out that once the inventory proportion of secondary rebar and tertiary rebar in the market is out of balance, the market price difference between them will be reduced accordingly, and even "secondary rebar sellers are more expensive than tertiary rebar". However, later, steel mills often adjust the production scheduling plan, increase the production of secondary rebar according to the order, and reduce the ex factory price difference or settlement price difference between the two. After that, the inventory proportion of secondary and tertiary rebar in the market will slowly recover, and the price difference between the two will gradually return to "normal"

this is why the above-mentioned "abnormal" situation occurs periodically in the price policies of Beijing and other steel cities and Hegang and other steel mills. In fact, secondary rebar has long been listed as eliminated by many ministries and commissions such as the Ministry of industry and information technology and the Ministry of housing and urban rural development. However, the above "abnormal" situation appears periodically, which reflects the deep-seated problem that secondary rebar, which has been repeatedly required to be eliminated by many ministries and commissions, still has a certain demand space in the current steel market, while high-strength rebar such as tertiary rebar still has great difficulty in the promotion process

the government has frequently issued documents requiring the elimination of secondary rebar

the tensile yield strength of secondary rebar is 335 MPa, which is called HRB335, and the corresponding tensile yield strength of high-strength rebar is 400 MPa or more, of which the tertiary rebar is HRB400 and the tertiary rebar is HRB500

compared with ordinary reinforcement, high-strength reinforcement has the characteristics of high strength and excellent comprehensive performance. Replacing grade II deformed steel bar with grade III deformed steel bar is conducive to improving the strength yield ratio and uniform elongation of the material, thus enhancing the seismic and tensile strength, and strengthening the safety performance of the building

at the same time, substituting grade III deformed steel bar for grade II deformed steel bar can also reduce China's steel consumption, save the use of iron ore, coke and electricity, reduce the emissions of CO2, waste gas and dust, and have a positive impact on resource conservation, reducing China's dependence on raw material import, energy conservation and emission reduction

in addition, at present, the adoption rate of 400MPa reinforcement in Britain, Germany, Australia, Japan and other countries has reached 80%-90%, while the proportion of high-strength reinforcement in China's total reinforcement output last year was only 45%

according to historical data, the Chinese government has long proposed "eliminating secondary rebar", "promoting the application of tertiary rebar", "replacing secondary rebar with tertiary rebar" and "increasing the output of tertiary rebar"

in the code for design of concrete structures implemented since april1,2002, HRB400 grade reinforcement is listed as the main load-bearing reinforcement; The application technology of HRB400 steel bar is listed as a promotion and application project in the "technology promoted, applied, restricted and prohibited by the Ministry of construction" issued by the Ministry of construction in 2004

in the development policy of iron and steel industry in 2005, it was clearly proposed to "reduce steel consumption by promoting grade III (400MPa) and above hot-rolled ribbed steel bars, high-strength steel plates for various purposes, H-beam and other steel products"

on december6,2010, the Ministry of industry and information technology published the guidance catalogue for eliminating backward production process equipment and products in some industrial industries (version 2010), which stipulates that "grade II rebar products must be eliminated according to the requirements of @c startup testing steel standard and building code in the construction industry"

in addition, the national standard code for design of concrete structures issued by the Ministry of housing and urban rural development has been formally implemented since July 1 last year, which also clearly stipulates that "know the application method of constant stress pressure testing machine, give priority to the use of grade III reinforcement in construction projects, gradually reduce grade 335mpa reinforcement and finally cancel this variety"

the 12th Five Year Plan for the development of the construction industry formulated by the Ministry of housing and urban rural development last year expressly requires that during the 12th Five Year Plan period, the amount of HRB400 and above reinforcement will reach 45% of the total amount, and the proportion of steel structure engineering will increase

in November last year, the 12th Five Year Plan for the development of the iron and steel industry clearly stated that "to adapt to the trend of reducing steel consumption, upgrade the standard of hot-rolled deformed steel bars, focus on the development of high-strength deformed steel bars, seismic steel bars and high-strength wire rods (hard wires) of 400 MPa and above; and focus on the promotion of the application of high-strength, seismic, fire-resistant and weather resistant steel plates and H-shaped steel in the field of steel structure construction" "Promote the use of 400 MPa and 500 MPa high-strength deformed bars in large and medium-sized cities across the country, and promote the upgrading and reduction application of building steel", "the comprehensive transformation and upgrading of building steel production enterprises to produce 400 MPa and above high-strength deformed bars". In addition, the 12th Five Year Plan for the development of the iron and steel industry also proposes that by the end of the 12th Five Year Plan, the proportion of high-strength steel bars above 400MPa in China should exceed 80%. In addition, the Ministry of housing and urban rural development and the Ministry of industry and information technology jointly issued the guidance on accelerating the application of high-strength reinforcement in January this year, which clearly stated that "accelerate the elimination of 335 MPa rebar, give priority to the use of 400 MPa rebar, and actively promote 500 MPa rebar", "eliminate 335 MPa rebar in construction projects by the end of 2013" "At the end of 2015, the output of high-strength steel bars accounted for 80% of the total output of deformed steel bars, and the amount used in construction projects reached more than 65% of the total amount of steel bars used in buildings", "on the basis of the application of 400 MPa grade deformed steel bars, 500 MPa grade deformed steel bars are preferred for large-scale high-rise buildings and long-span public buildings, and the production and use proportion of 500 MPa grade deformed steel bars are increased year by year"

Why is it difficult to popularize high strength steel bars

compared with the continuous and frequent documents issued by the above ministries and commissions, the promotion of grade III deformed bar in China is slow. Data show that in 1999, only 180000 tons of grade III steel bars were used in China; 264600 tons in 2000; 784700 tons in 2001; 1.86 million tons in 2003; It increased to 5.4 million tons in 2004

the proportion of high-strength steel bars in the total output of steel bars in China has not increased significantly until the last two years. The data show that the total output of steel bars in China in 2008 was 95.74 million tons, of which high-strength steel bars accounted for 27.6%; In 2009, the total output of domestic steel bars was 120million tons, of which high-strength steel bars accounted for 31.8%; In 2010, the output of steel bars in China was about 141 million tons, including 57.07 million tons of high-strength steel bars, accounting for 40.5% of the total output of steel bars; In 2011, China's steel production was about 151 million tons, of which high-strength steel accounted for about 45%

"two years ago, the consumption of grade II rebar and grade III rebar in Shanghai was about 50% and then developed to 46% and now it is about 37%. After 2009, the promotion of grade III rebar has increased." Zhang Wangjun, deputy general manager of my iron and steel business department, felt deeply about the change in the consumption of grade II and grade III rebar in Shanghai building materials market. In his opinion, the promotion of grade III deformed bar "mainly depends on the strength of the government"

a previous research report of Guojin Securities pointed out that "for a long time, steel products have been in the situation of determining production by sales. The market space of grade III rebar mainly depends on the Architectural Design Institute. It is difficult to achieve results by blindly restricting steel mills"

panwenge, director of the direct sales center of Maanshan Iron and Steel Co., Ltd., once told that Maanshan Iron and Steel Co., Ltd. had held many meetings in response to the task of promoting grade III rebar, but on the one hand, the steel plant wanted to eliminate grade II rebar, on the other hand, the orders for grade II rebar in the market were increasing

it is understood that at present, most steel mills have the technology to produce grade III rebar. However, as mentioned above, once the inventory proportion of grade II rebar and grade III rebar in the market is out of balance and the price is "abnormal", steel mills often choose to adjust the production schedule and increase the production of grade II rebar according to the order

according to the analysis of the Research Report of Guojin securities, the architectural design institute is the key to the promotion of grade III deformed steel bars, "making a monkey named" Jianhui "like the steel warrior in Avatar. During the years, the relevant policies of grade III steel issued by the Ministry of housing and urban rural development lacked operability, which helped to increase the inertia of the Architectural Design Institute and continued its design habits and concepts for decades. If the high-strength reinforcement is widely applied in the drawing design, the whole design idea should be changed, and various parameters such as stress, strength and safety factor should be recalculated, tested and tested again, resulting in a huge amount of work

"my steel" analyst zhenglingfeng agreed with the above view, "the project using ordinary reinforcement in the preliminary design has not been completed, and the high-speed railway project and bridge facilities still need to use secondary reinforcement"

he also added that there are other obstacles to the promotion of high-strength steel bars. For example, for small and medium-sized steel mills, the production of high-strength steel bars means that a large amount of money should be spent on improving production processes and equipment; For downstream users, the popularization of high-strength steel bars means that their steel processing equipment must be upgraded, which is also a cost

in addition, zhenglingfeng also mentioned that "the bank's collateral is mainly grade II steel bars. As far as the Shanghai market is concerned, grade III steel is mainly from small and medium-sized steel mills, which is easy to rust, and banks are generally unwilling to choose as collateral", which also delays the popularity of high-strength steel bars to a certain extent

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