Gnee AH32 Shipbuilding Steel Plate

"Gnee AH32 Shipbuilding Steel Plate" is a type of high-strength shipbuilding steel plate.

 

Characteristics:

 

High strength: The AH32 grade indicates a relatively high yield strength and tensile strength. This enables it to withstand heavy loads and stresses in shipbuilding applications.

Good toughness: Possesses excellent toughness, especially at low temperatures. This is crucial for ensuring the safety and durability of ships in various operating conditions.

Weldability: Designed to be weldable, allowing for easy fabrication and assembly during ship construction. However, proper welding techniques and procedures need to be followed to ensure high-quality welds.

Corrosion resistance: To some extent, it has resistance to corrosion from seawater and the marine environment. Additional protective coatings may be applied for enhanced corrosion protection.

 

Chemical composition:

 

Carbon (C): Typically in a controlled range to balance strength and weldability.

Silicon (Si): Helps improve strength and oxidation resistance.

Manganese (Mn): Contributes to strength and toughness.

Phosphorus (P) and Sulfur (S): Kept at low levels to ensure good weldability and mechanical properties.

Other alloying elements: May include small amounts of copper (Cu), chromium (Cr), nickel (Ni), etc., to enhance specific properties.

 

Product Name	Steel Grade
Hot Rolled Low Carbon Steel Plate	20#;45# ; Q215A/B, Q235A/B/C/D/E ;SS330, SS400 SS490;A36,S235JR+AR/JO+AR/J2+N/SA283 Gr.A/B/C, SPCC,SPHC, SPHD,SPCD,SPHE,SPCE
Low Alloy Steel plate	Q345A/B/C/D/E,16Mn, Q390A/B/C/D/E, Q420A/B/C/D/E, Q460C,Q550D,Q690D, SS540;A572 GR.50, S275JR, S355JR+AR/J0+AR/J2+N
Alloy Steel plate	30CrMnSiA, 10CrMoAL, 12Cr1MoV, 40Cr
Cold Rolled Steel sheet	SPCC, St12, DC01, Q235A/B, SPCE, ST14, DC04 , St15, DC05, SC3, St16, DC06, St17, SPCD, ST13,DC03,20-45#,08-15#
Z-Direction Property Plate	Q235A/B/C/D/E; Q345B/C/D/E;Q390B/C/D/E;Q420B/C/D/E (Z15, Z25,Z35)
Boiler& Pressure Vessel Plate	Q245R, Q245R+N, Q345R, Q345R+N, Q345R(R-HIC)16MnR,15CrMoR, 09MnNiDR, 12MnNiVR, Q370R, SA516Gr.60/65/70+N ,SA516MGr.485 SA387 Gr.11Cl2 , SA285 Gr.C
Low Temperature Pressure Vessel Plate	16MnDR
Pipeline Steel Plate	B,X42,X46,X52,X56,X65,X70,X80 ; L245, L290, L320, L360, L390, L415, L450,L485
Checker Plate	Q235B, SS400, A36 , S235JR, SA283 Gr.A/B/C
Weather resistant plate	NM360, NM400, NM450, NM500,B480GNQR,09CuPCrNi-A,09CrCuSb,SPA-H,Q235NH, Q295NH,Q355NH, Q460NH,Q550NH,09CuP
Ship plate	CCS/ABS/LR (A/B/D)

 

 

 

 

The production process and flow of shipbuilding steel plates mainly include the following stages:

 

 Raw Material Preparation

 

Selection of raw materials such as iron ore and coal:

Select high-quality iron ore with an iron content usually above 50% to ensure a sufficiently high iron content in the subsequent smelting process. For example, iron ore from Australia and Brazil is widely used due to its high iron content and low impurities.

At the same time, choose suitable coal as a reducing agent and energy source. The quality requirements for coal include high fixed carbon content and low ash and sulfur content.

Pretreatment of raw materials:

Iron ore undergoes crushing and beneficiation treatment to reduce its particle size to an appropriate range and remove impurities such as soil and sand. For example, methods such as magnetic separation or flotation are used to improve the purity of iron ore.

Coal also needs to be crushed and screened to ensure it can fully burn and play the role of a reducing agent during the smelting process.

 

Ironmaking

 

Blast furnace ironmaking:

The pretreated iron ore, coke, and limestone are loaded into the blast furnace in a certain proportion.

At high temperatures, coke burns to produce carbon monoxide. Carbon monoxide combines with oxygen in the iron ore to reduce iron and form molten iron. At the same time, limestone reacts with impurities in the ore to form slag.

Molten iron flows out from the bottom of the blast furnace, with a temperature usually above 1400°C. For example, a large blast furnace can produce thousands of tons of molten iron per day.

 

Steelmaking

 

Converter steelmaking or electric furnace steelmaking:

Converter steelmaking: Pour molten iron into the converter and add scrap steel and an appropriate amount of slagging materials. By blowing in oxygen, elements such as carbon, silicon, and manganese in the molten iron are oxidized to remove impurities and improve the purity of steel.

Electric furnace steelmaking: Use electric energy to heat and melt scrap steel and other raw materials. Partial molten iron can also be added. By adjusting the chemical composition in the furnace, the required steel grade requirements can be achieved.

 

 Rolling

 

Heating:

Send the continuous casting slab into the heating furnace for heating to reach an appropriate rolling temperature. Generally, the heating temperature is between 1100°C - 1300°C. The specific temperature depends on the steel grade and rolling process.

Rolling process:

The heated slab first enters the roughing mill for initial rolling to reduce its thickness to a certain extent.

Then it enters the finishing mill for multiple rolling passes to gradually reduce the thickness while improving the dimensional accuracy and surface quality of the steel plate. During the rolling process, parameters such as rolling speed and reduction ratio are controlled to adjust the properties of the steel plate.

 

 

 

 

 

We take pride in our ability to provide custom solutions for our customers' unique needs.
We analyze and compare the previous products and the current technical situation of our Gnee AH32 Shipbuilding Steel Plate, and develop new technical specifications and processes.
Our customers trust us to deliver high-quality Cold-rolled Steel products on time and on budget.
We strictly implement the warm and thoughtful after-sales service, adhere to the development of good professional ethics.
We offer a wide range of Cold-rolled Steel products to meet diverse customer needs.
We adhere to the customer-centric and brand-oriented business philosophy, and continue to provide customers with reliable and excellent products and services.
Our factory is committed to upholding the highest standards of safety and quality.
All staff of our company and all departments work together to combine business management, professional technology, quantitative statistical methods and ideological education.
Our Cold-rolled Steel products are known for their durability and reliability.
Relying on the superior conditions and strong advantages of mass production, we are able to meet the different needs of our customers.

 

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