A purchasing director of a steel mill once said: High-speed steel rolls are too expensive, and the cost is too high. We do not use high-speed steel rolls.
This steel mill is relatively well-known in the industry, with an annual output of 1 million tons of rebar bars. K1-K4 insists on purchasing high-boron and high-nickel-chromium rolls. The high-boron rolls are about 22,000 yuan/ton, and the high-nickel-chromium rolls are about About 10,000 yuan/ton. This year, the K1-K4 rolls cost a total of 4.8 million yuan.
There is also a steel mill with an annual output of 1 million tons of rebar that insists on purchasing high-speed steel rolls. K1-K4 uses high-speed steel rolls, which cost about 35,000 yuan/ton. After this year, the total cost of K1-K4 rolls is 2.2 million yuan. Less than half of high boron and high nickel chromium rolls.
Why is this? Please see the table below
Cost analysis of finished rolls:
| Project | HSS Roll | High Boron Roll | High Nickel Chromium Roll |
| Roll model | 380*650*1513 | 380*650*1513 | 380*650*1513 |
| K1 roll price (yuan/ton) | 35000 | 22000 | 11000 |
| Weight of a roll (tons) | 0.71 | 0.71 | 0.71 |
| Price of a pair of K1 rolls (yuan) | 49700 | 31240 | 15620 |
| Rolling specification (rebar) | Φ12 quarter cut | Φ12 quarter cut | Φ12 quarter cut |
| Number of slots | 242 | 24 | 24 |
| Available cycle | 8 | 5 | 5 |
| Amount of steel passing through a single channel (tons) | 350 | 150 | 100 |
| A pair of K1 rolls total passing steel (tons) | 67200 | 18000 | 12000 |
| Steel roll consumption per ton (yuan/ton) | 0.74 | 1.74 | 1.30 |
Cost analysis of slitting stand rolls:
| Project | HSS Roll | High Boron Roll | High Nickel Chromium Roll |
| Roll model | 380*650*1513 | 380*650*1513 | 380*650*1513 |
| K3 roll price (yuan/ton) | 35000 | 22000 | 11000 |
| Weight of a roll (tons) | 0.71 | 0.71 | 0.71 |
| Price of a pair of K3 rolls (yuan) | 49700 | 31240 | 15620 |
| Rolling specification (rebar) | Φ12 quarter cut | Φ12 quarter cut | Φ12 quarter cut |
| Number of slots | 6 | 6 | 6 |
| Available cycle | 8 | 5 | 5 |
| Amount of steel passing through a single channel (tons) | 2800 | 1100 | 600 |
| A pair of K3 rolls total passing steel (tons) | 134400 | 33000 | 18000 |
| Steel roll consumption per ton (yuan/ton) | 0.37 | 0.95 | 0.87 |
From the above two tables, it can be concluded that:
The unit price of high-speed steel rolls is indeed higher than that of high-boron and high-nickel-chromium rolls, but due to material characteristics, the steel passing capacity of high-speed steel rolls is much higher than that of high-boron and high-nickel-chromium rolls, such as 12 quarter-cut rebar, high-speed steel K1 single 350 tons of steel pass through the channel, only 150 tons of high boron, and only 100 tons of high nickel and chromium; the high-speed steel K3 single set of channel passes 2800 tons of steel, only 1100 tons of high boron, and only 600 tons of high nickel and chromium. Moreover, the hardness and wear resistance of the high-speed steel material is good, and the heavy vehicle load is low, so the service life is much higher than that of high-boron and high-nickel-chromium rolls.
Advantage analysis of using HSS rolls
1. Low consumption per ton of steel rolls
The consumption of high-speed steel rolls per ton of steel rolls is far lower than that of high-boron and high-nickel-chromium rolls, so the annual purchase cost of high-speed steel rolls in steel mills is far lower than that of high-boron and high-nickel-chromium rolls.
2. High steel passing capacity, improving the continuous operation time of the production line
The steel passing capacity of high-speed steel rolls is 2-4 times higher than that of high-boron and high-nickel-chromium rolls. continuous operating time of the production line.
Compared with high-boron and high-nickel-chromium rolls, the annual rolling output of high-speed steel rolls should be increased by 2%-4%, that is, steel mills with an annual output of 1 million tons of rebar, using high-speed steel rolls, can increase their annual production by 20,000-40,000 tons According to the profit of 300 yuan/ton, it is equivalent to earning 6-8 million yuan in one year (this money can buy hundreds of high-speed steel rolls)
3. High-speed steel rolls can effectively control the negative tolerance of rolled products and improve the yield
To put it bluntly, 100 tons of steel billets are invested, and the finished rebar produced is more than 100 tons.
The surface quality of the rebar rolled by high-speed steel rolls is very good, and the shape and smoothness enhance the market competitiveness of the product.
For steel mills, the purchase cost of several million rolls a year is nothing, and the quantity is king! One of the quantities refers to the output, and the other refers to the quality. Using high-speed steel rolls can increase the continuous operation time and increase the rolling output. , the output increases and the income increases; the use of high-speed steel rolls improves the surface quality of rolled materials, improves market competitiveness, and improves corporate reputation.
