CN104451459B - A kind of 490MPa level is containing high harmful element steel plate and manufacture method thereof - Google Patents
A kind of 490MPa level is containing high harmful element steel plate and manufacture method thereof Download PDFInfo
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Abstract
The invention discloses a kind of 490MPa level containing high harmful element steel plate and manufacture method thereof.Chemical composition and weight/mass percentage composition thereof are as follows: C%:0.12～0.18, Si%:0.2～0.5, P%:0.040～0.050；S%:0.040～0.050；As%:0.038～0.060；Mn configures according to Mn/S amount ratio >=10, and remaining is Fe and inevitable impurity element.The chemical composition of steel, based on C, Mn, Si, P, S element, high-load harmful element P, S, As, without other Strengthening and Toughening alloying elements, thus reduces the production cost of prototype steel.Meeting thickness specification is 6～100mm, and tensile strength is 490～630MPa, elongation after fracture >=25%, the D level steel plate technology requirement of 20 DEG C >=100J of low temperature impact properties.
Description
Technical field
The invention belongs to alloy high strength Plate Production technical field, be specifically related to a kind of 490MPa level containing high harmful element steel plate
And manufacture method.
Background technology
Tensile strength 490～630MPa rank low-alloy high-strength steel plate is widely used in building structure, bridge, hull building, is
The high intensity plate varieties that usage amount is the biggest.At present, the steel plate composition design of this intensity rank general use the strictest P,
S content controls, or adds the mode of alloy element.Such as tensile strength in European standard EN10025-2 " hot-rolled structural steel "
P, S in chemical composition are controlled to be respectively as follows: P≤0.035%, S≤0.035% by the steel S355 rank steel of more than 470MPa.And
In American Standard A572 " High-Strength Low-Alloy niobium vanadium alloy ", tensile strength 485MPa level and above steel Gr50 are in chemical composition
P, S control to be respectively as follows: P≤0.040%, S≤0.050%, must be added to simultaneously the element nb of crystal grain thinning or V or two kinds with
Upper alloying element.And tensile strength 470MPa level and above steel in China's GB GB/T1591 " low-alloy high-tensile structural steel "
Q345 controls requirement to P, S in chemical composition and is respectively as follows: P≤0.035%, S≤0.035%.Though and in current national and foreign standards
Right not mentioned residual elements As content, but during actual control, As content general control is below 0.030%；Produce simultaneously
The process route of the commonly used smelting-continuous casting of manufacture method-strand slow cooling-strand heating-rolling.This composition design and processes route
Cost declining strategy high at current ore price, iron and steel enterprise is the most suitable, this is because on the one hand, uses containing low
The high-quality molten iron cost of harmful element P, S higher, on the other hand slab cooling after continuous casting, then carry out heating rolling generation
Energy loss causes again the increase of cost.
Summary of the invention
Present invention aim at reducing the manufacturing cost of prototype steel grade, it is provided that a kind of manufacture method containing high harmful element steel plate, real
Now use low-grade molten iron smelting, minimizing energy loss mode to obtain intensity 490MPa level and with upper steel plate, meet the market demand.
For reaching such scheme, use technical scheme as follows:
A kind of 490MPa level is containing high harmful element steel plate, and chemical composition and weight/mass percentage composition thereof are as follows: C%:0.12～0.18,
Si%:0.2～0.5, P%:0.040～0.050；S%:0.040～0.050；As%:0.038～0.060；Mn is according to Mn/S
Amount ratio >=10 configure, and remaining is Fe and inevitable impurity element；Its thickness specification is 6～100mm, and tension is strong
Degree is 490～630MPa, elongation after fracture >=25%, low temperature impact properties-20 DEG C >=100J.
A kind of 490MPa level is containing high harmful element steel plate, and chemical composition and weight/mass percentage composition thereof are as follows: C%:0.14～0.16,
Si%:0.3～0.45, P%:0.040～0.050；S%:0.040～0.050；As%:0.045～0.050；Mn is according to Mn/S
Amount ratio 10-30 configures, and remaining is Fe and inevitable impurity element；Its thickness specification is 6～100mm, tension
Intensity is 490～630MPa, elongation after fracture >=25%, low temperature impact properties-20 DEG C >=100J.
A kind of 490MPa level is containing high harmful element steel plate, and chemical composition and weight/mass percentage composition thereof are as follows: C%:0.16, Si%:
0.3, P%:0.045；S%:0.045；As%:0.045；Mn configures according to Mn/S amount ratio 17.8, and remaining is Fe
With inevitable impurity element；Its thickness specification is 6～100mm, and tensile strength is 490～630MPa, elongation after fracture
>=25%, low temperature impact properties-20 DEG C >=100J.
The above-mentioned 490MPa level manufacture method containing high harmful element steel plate, comprises the following steps:
1) blast-melted being combined at the bottom of entrance oxygen top after mixed iron blast blows formula converter smelting, or blast-melted being directly entered is bessemerized,
Alloy deoxidation alloying is used after smelting；Then use low Argon to molten steel composition homogenization, and make inclusion floating；Use argon
Gas shielded pours into 200～300mm strands；
2), after being casting continuously to form base, use hot-loading and hot-conveying mode to load heating furnace and heat, enter strand temperature >=800 DEG C of heating furnace；
The rate of heat addition is 8～11min/cm, and soaking temperature is 1200～1260 DEG C, soaking time 20～30min, and tapping temperature is
1150～1180 DEG C；
3) rolling uses the mode of controlled rolling, total compression ratio >=3；First stage rolls in austenite recrystallization district, open rolling
Temperature is 1150～1165 DEG C, and finishing temperature control is at 1030～1050 DEG C, and workpiece thickness is 50～150mm；Second stage is rolled
System is carried out at austenite Unhydrated cement, and start rolling temperature 850～950 DEG C, finishing temperature is 790～850 DEG C；ACC is used after rolling,
Watering a small amount of water cooling, after cold rear temperature is 600～700 DEG C, air cooling obtains product.
A kind of 490MPa level manufacture method containing high harmful element steel plate, its chemical composition and weight/mass percentage composition thereof are as follows: C%:
0.16, Si%:0.3, P%:0.045；S%:0.045；As%:0.045；Mn joins according to Mn/S amount ratio 17.8
Putting, remaining is Fe and inevitable impurity element；Its thickness specification is 6～100mm, and tensile strength is 490～630MPa,
Elongation after fracture >=25%, low temperature impact properties-20 DEG C >=100J；
Blast-melted after mixed iron blast, use top end formula combined blown converter to smelt into molten steel, use ferrosilicon, silicomangan deoxidation, conjunction
Aurification, after deoxidation, steel oxygen content in water is 30ppm；Molten steel accesses argon pipeline through bottom, carries out Argon process, argon blowing time
For 7min；After Argon completes, molten steel uses argon shield to be casting continuously to form the strand of 250mm through platform；
Continuous casting is direct warm car hot-loading and hot-conveying after completing, and heats, the rate of heat addition enter strand heating furnace when 850 DEG C in
For 8.5min/cm, soaking temperature is 1230 DEG C, soaking time 25min, and tapping temperature is 1180 DEG C；
Rolling uses the mode of controlled rolling, and the first stage rolls in austenite recrystallization district, and start rolling temperature is 1165 DEG C, finish to gauge
Temperature controls at 1050 DEG C, and workpiece thickness is 110mm；Second stage rolling is carried out at austenite Unhydrated cement, open rolling temperature
Spending 910 DEG C, finishing temperature is 850 DEG C；Using ACC after rolling, water a small amount of water cooling, cold rear temperature is 700 DEG C；Then steel plate
Air cooling, to room temperature, obtains the steel plate that thickness is 50mm.
The C content of the present invention selects 0.12～0.18%, and C is one of element of indispensable raising steel strength in steel,
Carbon content often increases by 0.10%, and tensile strength about improves 90MPa, and yield strength about improves 40～50MPa.Along with carbon content
Increasing, the plasticity of steel and toughness index can reduce, and welding performance is deteriorated.When the steel that welding C content is higher, at sweating heat
The zone of influence also occurs as soon as phenomenon of hardening, and produces the tendency of cold crack when this is by aggravation welding.So the C content upper limit controls 0.18%.
Si content in the present invention selects 0.2～0.4%, and Si mainly improves the intensity of steel in steel with solution strengthening form, also
It it is the deoxidant element in steel.But in steel during Si too high levels, then reduction of area can be caused to decline, particularly impact toughness decreased is more
Substantially, simultaneously the most unfavorable to welding performance, therefore in steel, Si content is difficult to too high, and therefore the upper limit controls 0.4%.
In the present invention, Mn is to ensure that the important element of intensity, meanwhile, for reducing S, steel is produced hot-short tendency, it is generally the case that
By adding Mn in steel, it is ensured that certain Mn/S ratio, such that it is able to reduce the hot-short tendency of S.Mn/S ratio in the present invention
More than 10, thus ensure the thermoplasticity of steel.
The beneficial effects of the present invention is:
1) chemical composition of steel is based on C, Mn, Si, P, S element, and high-load harmful element P, S, As, without other
Strengthening and Toughening alloying element, thus reduce the production cost of prototype steel.
2) mode of hot-loading and hot-conveying after employing continuous casting, thus after reducing slab cooling, reheat the energy consumptions such as the coal gas of use, electricity, fall
Low production cost.
3) meeting thickness specification is 6～100mm, and tensile strength is 490～630MPa, elongation after fracture >=25%, and low temperature rushes
Hit the D level steel plate technology requirement of performance-20 DEG C >=100J.
4) this production process is easily controllable, and energy consumption is relatively low, meets the demand of present steel enterprise low-cost manufacturing technique.
Detailed description of the invention
Following example explain technical scheme further, but not as limiting the scope of the invention.
490MPa level of the present invention contains high harmful element steel plate, and chemical composition and weight/mass percentage composition thereof are as follows: C%:0.12～0.18,
Si%:0.2～0.5, P%:0.040～0.050；S%:0.040～0.050；As%:0.038～0.060；Mn is according to Mn/S
Amount ratio >=10 configure, and remaining is Fe and inevitable impurity element；The chemical composition of steel based on C, Mn, Si, P,
S element, high-load harmful element P, S, As, without other Strengthening and Toughening alloying elements, thus the production reducing prototype steel becomes
This；Meet thickness specification is 6～100mm simultaneously, and tensile strength is 490～630MPa, elongation after fracture >=25%, low temperature
The D level steel plate technology requirement of impact property-20 DEG C >=100J.
Its manufacture process is as follows:
1) blast-melted being combined at the bottom of entrance oxygen top after mixed iron blast blows formula converter smelting, or blast-melted being directly entered is bessemerized,
Alloy deoxidation alloying is used after smelting；Then use low Argon to molten steel composition homogenization, and make inclusion floating；Use argon
Gas shielded pours into 200～300mm strands；
2), after being casting continuously to form base, use hot-loading and hot-conveying mode to load heating furnace and heat, enter strand temperature >=800 DEG C of heating furnace；
The rate of heat addition is 8～11min/cm, and soaking temperature is 1200～1260 DEG C, soaking time 20～30min, and tapping temperature is
1150～1180 DEG C；
3) rolling uses the mode of controlled rolling, total compression ratio >=3；First stage rolls in austenite recrystallization district, open rolling
Temperature is 1150～1165 DEG C, and finishing temperature control is at 1030～1050 DEG C, and workpiece thickness is 50～150mm；Second stage is rolled
System is carried out at austenite Unhydrated cement, and start rolling temperature 850～950 DEG C, finishing temperature is 790～850 DEG C；ACC is used after rolling,
Watering a small amount of water cooling, after cold rear temperature is 600～700 DEG C, air cooling obtains product.
The mode of hot-loading and hot-conveying after employing continuous casting, thus after reducing slab cooling, reheat the energy consumptions such as the coal gas of use, electricity, reduce
Production cost.This production process is easily controllable, and energy consumption is relatively low, meets the demand of present steel enterprise low-cost manufacturing technique.
Below by five specific embodiments in detail the present invention being described in detail, the smelting component of its each embodiment is as shown in table 1.
Table 1
| Embodiment | C/% | Si/% | Mn/% | P/% | S/% | As/% |
| 1 | 0.12 | 0.2 | 0.45 | 0.04 | 0.04 | 0.038 |
| 2 | 0.16 | 0.30 | 0.8 | 0.045 | 0.045 | 0.045 |
| 3 | 0.18 | 0.45 | 1.2 | 0.050 | 0.048 | 0.050 |
| 4 | 0.14 | 0.50 | 1.0 | 0.045 | 0.040 | 0.060 |
| 5 | 0.18 | 0.50 | 1.45 | 0.050 | 0.050 | 0.055 |
Embodiment 1:
The smelting component of steel billet is as shown in table 1.
Blast-melted after mixed iron blast, use top end formula combined blown converter to smelt into molten steel, use ferrosilicon, silicomangan deoxidation, conjunction
Aurification, after deoxidation, steel oxygen content in water is 25ppm；Molten steel accesses argon pipeline through bottom, carries out Argon process, argon blowing time
For 5min.After Argon completes, molten steel uses argon shield to be casting continuously to form the strand of 200mm through platform, and continuous casting is direct warp after completing
Thermal car hot-loading and hot-conveying, heats enter strand heating furnace when 810 DEG C in, and the rate of heat addition is 8min/cm, and soaking temperature is
1200 DEG C, soaking time 20min, tapping temperature is 1170 DEG C, and rolling uses the mode of controlled rolling, and the first stage is at Ovshinsky
Body recrystallization zone rolls, and start rolling temperature is 1155 DEG C, and finishing temperature control is at 1040 DEG C, and workpiece thickness is 50mm；Second
Stage rolling is carried out at austenite Unhydrated cement, start rolling temperature 950 DEG C, and finishing temperature is 790 DEG C；ACC is used after rolling,
Watering a small amount of water cooling, cold rear temperature is 650 DEG C；Then steel plate air cooling is to room temperature, obtains the steel plate that thickness is 6mm.
Embodiment 2:
The smelting component of steel billet is as shown in table 1.
Blast-melted after mixed iron blast, use top end formula combined blown converter to smelt into molten steel, use ferrosilicon, silicomangan deoxidation, conjunction
Aurification, after deoxidation, steel oxygen content in water is 22ppm；Molten steel accesses argon pipeline through bottom, carries out Argon process, argon blowing time
For 5min.After Argon completes, molten steel uses argon shield to be casting continuously to form the strand of 200mm through platform, and continuous casting is direct warp after completing
Thermal car hot-loading and hot-conveying, heats enter strand heating furnace when 850 DEG C in, and the rate of heat addition is 8.5min/cm, soaking temperature
Being 1230 DEG C, soaking time 25min, tapping temperature is 1180 DEG C, and rolling uses the mode of controlled rolling, and the first stage is in Austria
Family name's body recrystallization zone rolls, and start rolling temperature is 1165 DEG C, and finishing temperature control is at 1050 DEG C, and workpiece thickness is 100mm；
Second stage rolling is carried out at austenite Unhydrated cement, and start rolling temperature 920 DEG C, finishing temperature is 820 DEG C；ACC is used after rolling,
Watering a small amount of water cooling, cold rear temperature is 670 DEG C；Then steel plate air cooling is to room temperature, obtains the steel plate that thickness is 30mm.
Embodiment 3:
The smelting component of steel billet is as shown in table 1.
Blast-melted after mixed iron blast, use top end formula combined blown converter to smelt into molten steel, use ferrosilicon, silicomangan deoxidation, conjunction
Aurification, after deoxidation, steel oxygen content in water is 30ppm；Molten steel accesses argon pipeline through bottom, carries out Argon process, argon blowing time
For 7min.After Argon completes, molten steel uses argon shield to be casting continuously to form the strand of 250mm through platform, and continuous casting is direct warp after completing
Thermal car hot-loading and hot-conveying, heats enter strand heating furnace when 850 DEG C in, and the rate of heat addition is 8.5min/cm, soaking temperature
Being 1230 DEG C, soaking time 25min, tapping temperature is 1180 DEG C, and rolling uses the mode of controlled rolling, and the first stage is in Austria
Family name's body recrystallization zone rolls, and start rolling temperature is 1165 DEG C, and finishing temperature control is at 1050 DEG C, and workpiece thickness is 110mm；
Second stage rolling is carried out at austenite Unhydrated cement, and start rolling temperature 910 DEG C, finishing temperature is 850 DEG C；ACC is used after rolling,
Watering a small amount of water cooling, cold rear temperature is 700 DEG C；Then steel plate air cooling is to room temperature, obtains the steel plate that thickness is 50mm.
Embodiment 4:
The smelting component of steel billet is as shown in table 1.
Blast-melted be directly entered converter, use top end formula combined blown converter to smelt into molten steel, use ferrosilicon, silicomangan deoxidation,
Alloying, after deoxidation, steel oxygen content in water is 25ppm；Molten steel accesses argon pipeline through bottom, carries out Argon process, during Argon
Between be 8min.After Argon completes, molten steel uses argon shield to be casting continuously to form the strand of 300mm through platform, and continuous casting is direct after completing
Warm car hot-loading and hot-conveying, heats enter strand heating furnace when 850 DEG C in, and the rate of heat addition is 11min/cm, soaking temperature
Degree is 1260 DEG C, soaking time 30min, and tapping temperature is 1180 DEG C, and rolling uses the mode of controlled rolling, and the first stage exists
Austenite recrystallization district rolls, and start rolling temperature is 1160 DEG C, and finishing temperature control is at 1045 DEG C, and workpiece thickness is 150mm；
Second stage rolling is carried out at austenite Unhydrated cement, and start rolling temperature 890 DEG C, finishing temperature is 850 DEG C；ACC is used after rolling,
Watering a small amount of water cooling, cold rear temperature is 650 DEG C；Then steel plate air cooling is to room temperature, obtains the steel plate that thickness is 80mm.
Embodiment 5:
The smelting component of steel billet is as shown in table 1.
Blast-melted be directly entered converter, use top end formula combined blown converter to smelt into molten steel, use ferrosilicon, silicomangan deoxidation,
Alloying, after deoxidation, steel oxygen content in water is 20ppm；Molten steel accesses argon pipeline through bottom, carries out Argon process, during Argon
Between be 6min.After Argon completes, molten steel uses argon shield to be casting continuously to form the strand of 300mm through platform, and continuous casting is direct after completing
Warm car hot-loading and hot-conveying, heats enter strand heating furnace when 820 DEG C in, and the rate of heat addition is 9min/cm, soaking temperature
Being 1250 DEG C, soaking time 30min, tapping temperature is 1150 DEG C, and rolling uses the mode of controlled rolling, and the first stage is in Austria
Family name's body recrystallization zone rolls, and start rolling temperature is 1130 DEG C, and finishing temperature control is at 1030 DEG C, and workpiece thickness is 120mm；
Second stage rolling is carried out at austenite Unhydrated cement, and start rolling temperature 850 DEG C, finishing temperature is 800 DEG C；ACC is used after rolling,
Watering a small amount of water cooling, cold rear temperature is 660 DEG C；Then steel plate air cooling is to room temperature, obtains the steel plate that thickness is 100mm.
The actual performance of embodiment 1-5 products therefrom is as shown in table 2.
Table 2
Claims (3)
1. the 490MPa level manufacture method containing high harmful element steel plate, it is characterised in that comprise the following steps:
1) blast-melted being combined at the bottom of entrance oxygen top after mixed iron blast blows formula converter smelting, or blast-melted being directly entered is bessemerized,
Alloy deoxidation alloying is used after smelting；Then use low Argon to molten steel composition homogenization, and make inclusion floating；Use argon
Gas shielded pours into 200～300mm strands；
2), after being casting continuously to form base, use hot-loading and hot-conveying mode to load heating furnace and heat, enter strand temperature >=800 DEG C of heating furnace；
The rate of heat addition is 8～11min/cm, and soaking temperature is 1200～1260 DEG C, soaking time 20～30min, and tapping temperature is
1150～1180 DEG C；
3) rolling uses the mode of controlled rolling, total compression ratio >=3；First stage rolls in austenite recrystallization district, open rolling
Temperature is 1150～1165 DEG C, and finishing temperature control is at 1030～1050 DEG C, and workpiece thickness is 50～150mm；Second stage is rolled
System is carried out at austenite Unhydrated cement, and start rolling temperature 850～950 DEG C, finishing temperature is 790～850 DEG C；ACC is used after rolling,
Watering a small amount of water cooling, after cold rear temperature is 600～700 DEG C, air cooling obtains product；
Its chemical composition and weight/mass percentage composition are as follows: C%:0.12～0.18, Si%:0.2～0.5, P%:0.040～0.050；
S%:0.040～0.050；As%:0.038～0.060；Mn configures according to Mn/S amount ratio >=10, remaining be Fe and
Inevitably impurity element；Its thickness specification is 6～100mm, and tensile strength is 490～630MPa, elongation after fracture >=
25%, low temperature impact properties-20 DEG C >=100J.
2. the 490MPa level manufacture method containing high harmful element steel plate, it is characterised in that comprise the following steps:
1) blast-melted being combined at the bottom of entrance oxygen top after mixed iron blast blows formula converter smelting, or blast-melted being directly entered is bessemerized,
Alloy deoxidation alloying is used after smelting；Then use low Argon to molten steel composition homogenization, and make inclusion floating；Use argon
Gas shielded pours into 200～300mm strands；
2), after being casting continuously to form base, use hot-loading and hot-conveying mode to load heating furnace and heat, enter strand temperature >=800 DEG C of heating furnace；
The rate of heat addition is 8～11min/cm, and soaking temperature is 1200～1260 DEG C, soaking time 20～30min, and tapping temperature is
1150～1180 DEG C；
3) rolling uses the mode of controlled rolling, total compression ratio >=3；First stage rolls in austenite recrystallization district, open rolling
Temperature is 1150～1165 DEG C, and finishing temperature control is at 1030～1050 DEG C, and workpiece thickness is 50～150mm；Second stage is rolled
System is carried out at austenite Unhydrated cement, and start rolling temperature 850～950 DEG C, finishing temperature is 790～850 DEG C；ACC is used after rolling,
Watering a small amount of water cooling, after cold rear temperature is 600～700 DEG C, air cooling obtains product；
Its chemical composition and weight/mass percentage composition are as follows: C%:0.14～0.16, Si%:0.3～0.45, P%:0.040～0.050；
S%:0.040～0.050；As%:0.045～0.050；Mn configures according to Mn/S amount ratio 10-30, and remaining is Fe
With inevitable impurity element；Its thickness specification is 6～100mm, and tensile strength is 490～630MPa, elongation after fracture
>=25%, low temperature impact properties-20 DEG C >=100J.
3. the 490MPa level manufacture method containing high harmful element steel plate, it is characterised in that chemical composition and percent mass thereof contain
Measure as follows: C%:0.16, Si%:0.3, P%:0.045；S%:0.045；As%:0.045；Mn is according to Mn/S consumption
Configuring than 17.8, remaining is Fe and inevitable impurity element；Its thickness specification is 6～100mm, and tensile strength is
490～630MPa, elongation after fracture >=25%, low temperature impact properties-20 DEG C >=100J；
Blast-melted after mixed iron blast, use top end formula combined blown converter to smelt into molten steel, use ferrosilicon, silicomangan deoxidation, conjunction
Aurification, after deoxidation, steel oxygen content in water is 30ppm；Molten steel accesses argon pipeline through bottom, carries out Argon process, argon blowing time
For 7min；After Argon completes, molten steel uses argon shield to be casting continuously to form the strand of 250mm through platform；
Continuous casting is direct warm car hot-loading and hot-conveying after completing, and heats, the rate of heat addition enter strand heating furnace when 850 DEG C in
For 8.5min/cm, soaking temperature is 1230 DEG C, soaking time 25min, and tapping temperature is 1180 DEG C；
Rolling uses the mode of controlled rolling, and the first stage rolls in austenite recrystallization district, and start rolling temperature is 1165 DEG C, finish to gauge
Temperature controls at 1050 DEG C, and workpiece thickness is 110mm；Second stage rolling is carried out at austenite Unhydrated cement, open rolling temperature
Spending 910 DEG C, finishing temperature is 850 DEG C；Using ACC after rolling, water a small amount of water cooling, cold rear temperature is 700 DEG C；Then steel plate
Air cooling, to room temperature, obtains the steel plate that thickness is 50mm.
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| JP5321672B2 (en) * | 2011-11-08 | 2013-10-23 | Ｊｆｅスチール株式会社 | High-tensile hot-rolled steel sheet with excellent material uniformity and manufacturing method thereof |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101139687A (en) * | 2007-10-12 | 2008-03-12 | 莱芜钢铁集团有限公司 | Weather-resistant hot rolled broad steel strip and method for manufacturing same |
| CN102330020A (en) * | 2011-10-20 | 2012-01-25 | 武汉钢铁(集团)公司 | Manufacturing method for high-toughness steel plates with yield strength of 345 to 390MPa |
| CN102424932A (en) * | 2011-11-22 | 2012-04-25 | 莱芜钢铁集团有限公司 | Production method of hot-rolled 500N Australian standard steel bar |
| CN102605241A (en) * | 2011-12-30 | 2012-07-25 | 内蒙古包钢钢联股份有限公司 | Normalizing type 16MnDR low temperature pressure vessel steel plate and manufacturing method thereof |
| CN102703805A (en) * | 2012-06-22 | 2012-10-03 | 内蒙古包钢钢联股份有限公司 | Normalized ship plate steel and production method thereof |
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