GB 50930-2013Code for design of cold rolling strip plant (English PDF)

2.1 Terminology

2.1.1 Cold rolled strip

Cold-rolled strip steel refers to the strip steel produced by using hot-rolled strip steel as raw material and undergoing processes such as pickling, cold rolling, (degreasing), annealing, smoothing, and finishing.

2.1.2 Coated cold rolled steel strip

Cold-rolled coated strip steel refers to the strip steel produced by cold-rolled steel coil, surface degreasing, annealing, and coating, including hot-dip galvanized strip steel (hot-dip galvanized aluminum 5% Al strip steel, hot-dip galvanized aluminum zinc 55% Al strip steel, etc.), electro-galvanized strip steel, electro-tin-plated steel strip (including chrome-plated steel strip).

2.1.3 Organic coated cold rolled steel strip

Cold-rolled coated steel strip refers to the steel strip produced by surface degreasing, coating or cladding with annealed and flattened steel coil or coated steel coil as raw material, also known as color coated steel strip.

2.1.4 Push-pull pickling line (PPL) push-pull pickling line

The unit does not have a welding machine and a large-capacity looper. The steel coil is uncoiled, corner-cut, pickled, rinsed, dried, edge-trimmed, oiled, coiled and other processes, and the pickling unit is a single-coil intermittent production.

2.1.5 Continuous pickling line (CPL) continuous pickling line

Pickling unit for continuous production of steel coils after uncoiling, welding, mechanical scale breaking, pickling, rinsing, drying, edge trimming, oiling, coil splitting, coiling and other processes.

2.1.6 Cold Reversing Mill (CRM) cold reversing mill

The strip is reciprocally rolled on the rolling mill to finally obtain the required thickness of the rolling mill. There are two kinds of single-stand reversing cold-rolling unit and double-stand reversing cold-rolling unit.

2.1.7 Tandem Cold Mill (TCM) tandem cold mill

A cold tandem rolling unit with 3 or more racks arranged in series. It is divided into conventional tandem cold rolling mill (TCM), full continuous cold tandem rolling mill (FTCM) and pickling and rolling mill combination (PLTCM).

2.1.8 Electrolytic degreasing unit (ECL) electrolytic cleaning line

The cold-rolled steel coil is uncoiled, welded, degreased, coiled and other processes, and the production unit continuously degreases the surface of the strip.

2.1.9 Bell annealing furnace (BAF) batch annealing furnace

An annealing furnace in which the stacked steel coils are recrystallized and annealed in the hood.

2.1.10 Continuous annealing line (CAL) continuous annealing line

The cold-rolled steel coil is continuously annealed through uncoiling, welding, degreasing, annealing, smoothing, trimming, inspection, oiling, coiling, and other processes.

2.1.11 Temper mill

It is a unit used to improve the mechanical properties and flatness of cold-rolled strip steel, eliminate the yield plateau of strip steel after annealing, and improve the surface quality of strip steel. There are two types of separation line leveling unit and online leveling machine.

2.1.12 Continuous hot dip galvani-zing line (CGL) continuous hot dip galvani-zing line

Cold-rolled steel coils are uncoiled, welded, degreased, annealed, hot dipped, (alloyed), cooled after plating, skinned, stretched, post-treated (passivation, anti-fingerprint, phosphating, etc.), (trimmed), inspection, oiling, coiling, and other processes to continuously form a zinc layer (or zinc alloy layer) on the surface of the strip.

2.1.13 Continuous electrolytic gal-vanizing line (EGL) continuous electrolytic gal-vanizing line

The cold-rolled steel coil after annealing and leveling undergoes uncoiling, welding, (stretching and straightening), degreasing, pickling, electroplating, passivation, inspection, oiling, coiling, and other processes, and the production of continuous electrogalvanizing on the surface of the strip unit.

2.1.14 Continuous electrolytic tin-ning line (ETL) continuous electrolytic tin-ning line

The cold-rolled steel coil after annealing and leveling is continuously electroplated on the surface of the strip through the processes of uncoiling, welding, (stretching and straightening), degreasing, pickling, electroplating, reflow, passivation, inspection, oiling, coiling, and coiling. Tin production unit.

2.1.15 Color coating line (CCL) color coating line

Coating organic color paint or pasting plastic film on cold-rolled or coated or plated substrates to produce colored organic-coated or plastic-coated strip steel production units.

2.1.16 Finishing line

According to user requirements, inspect, trim, (stretch and straighten), coil, cross-cut, slitting and packaging the finished cold-rolled strip, including recoiling (inspection) unit, cross-cutting unit, slitting unit, packaging unit.

2.1.17 Acid regeneration plant (ARP) acid regeneration plant

A facility that reacts the waste acid produced by the pickling unit to generate regenerated acid.

2.1.18 Basic automation system (L1) basic automation system

A control system that realizes the collection and processing of on-site data, data exchange, and the execution of commands required by output devices.

2.1.19 Process automation system (L2) process automation system

A control system that uses computer technology and software engineering to make the production process more efficient and safer.

2.1.20 Manufacturing execution system (MES) manufacturing execution system

Responsible for coordinating the production between processes or workshops, rationally allocating resources, executing and completing the production tasks issued by the enterprise resource planning ERP system, carrying out production planning and scheduling for problems in actual production, and implementing product quality management and control systems.

2.1.21 Intercom system

It is a multi-functional PA communication system that realizes dispatching and contacting with or without a center, all-call or group-call command calls, interrupt calls, conference calls, etc.

2.2 Abbreviations

B/S - browser/server (Browser/Server);

C/S - Client/Server (Client/Server);

CPU - Central Processing Unit (Central Processing Unit);

D1——Digital TV system 480i display format (Digital 1);

ERP - Enterprise Resource Planning (Enterprise Resource Planning);

HMI - Human Machine Interface (Human Machine Interface);

IP - computer network communication protocol (Internet Protocol);

I/O - Input/Output (Input/Output).

IPC——Industrial Personal Computer (Industrial Personal Computer);

OA - Office Automation (Office Automation);

PLC - Programmable Logic Controller (Programmable Logic Controller);

QoS - Quality of Service;

RAID - Disk Array (Redundant Arrays of Independent Disks);

TCP/IP - Transmission Control Protocol/Internet Protocol (Transmission Control Protocol/Internet Protocol);

UPS——uninterruptible power supply (Uninterruptible Power Supply);

VLAN - virtual local area network (Virtual Local Area Network).

4.1 General provisions

4.1.1 The determination of the production process and the selection of operating equipment should be determined after technical and economic comparisons based on factors such as production scale, product plan, production method, raw material, fuel performance and plant construction conditions.

4.1.2 The public and auxiliary facilities shall meet the production requirements.

4.2 Process flow

4.2.1 The production of cold-rolled steel strip shall comply with the following process flow.

4.2.2 The production of cold-rolled coated and coated steel strips shall comply with the following process flow.

4.3 Production units and cranes

4.3.1 The selection of the production unit shall comply with the relevant provisions of the current national standards "Code for Design of Strip Rolling Process" GB 50629, "Code for Design of Strip Finishing Process" GB 50713 and "Code for Design of Industrial Furnaces in Iron and Steel Plants" GB 50486.

4.3.2 The type, lifting tonnage, working level and control mode of the crane shall be selected according to the requirements of the production process.

4.3.3 Cranes should be equipped with inspection hoists and inspection platforms.

4.4 Workshop Layout

4.4.1 The layout of the workshop should be in accordance with the requirements of the production process and smooth logistics, and the production units should be reasonably arranged to avoid cross-transportation.

4.4.2 The warehouse area should meet the reasonable production turnover needs.

4.4.3 Production units of the same type should be arranged in a centralized manner.

4.4.4 The layout of the workshop should meet the layout requirements of the workshop transportation road, production operation and equipment maintenance site, underground pipe gallery and trench.

4.4.5 The space between equipment and between equipment and buildings (structures) shall meet the requirements of production, operation, installation, maintenance and fire protection.

4.4.6 Production auxiliary facilities should be close to the main production unit.

4.4.7 The elevation of the track surface of the factory building shall meet the maintenance requirements at the highest point of the production unit.

4.5 Workshop piping

4.5.1 The workshop pipes should be laid along the columns, pipe trenches or underground pipe corridors of the workshop, and shall not hinder the passage, opening of doors and windows and daylighting.

4.5.2 When multiple pipes are arranged up and down, the following requirements shall be met.

1 The hot medium pipeline is above the cold medium pipeline;

2 The non-corrosive medium pipeline is above the corrosive medium pipeline;

3 The gas pipeline is above the liquid pipeline;

4 The metal pipe is above the non-metal pipe;

5 Insulated pipes are above uninsulated pipes.

4.5.3 When multiple pipes are arranged horizontally against the wall, it is advisable to place thick pipes, normal temperature pipes, and pipes with few branches close to the wall, and thinner pipes, hot pipes, and pipes with many branches outside.

4.5.4 Flanges and valves shall not be set above the sidewalk for heat medium pipelines and corrosive medium pipelines. The valve parts on the riser should be arranged within the range of 1.2m ~ 1.5m from the ground. When it needs to be arranged above 2m, an operation platform should be provided.

4.5.5 The gas pipeline should be arranged away from the power supply side of the crane.

4.6 Workshop transportation

4.6.1 On-line walking beams, transport chains, and coil trolleys should be used for steel coil transportation between processes.

4.6.2 The replacement rolls should be transported directly to the grinding roll room.

4.6.3 After collection, the head and tail waste and trimming waste should be directly transported outside the factory, and transport vehicles should not enter the workshop.

6.1 General provisions

6.1.1 The power supply and distribution design of the production unit shall comply with the relevant provisions of the current national standard "Code for Design of Power Supply and Distribution System" GB 50052.

6.2 Power supply

6.2.1 The production unit shall be powered by at least one dedicated line or two high (medium) voltage power lines. In the case of two-way power supply, when one circuit fails and the power is cut off, the other circuit should be able to bear the fault state load or the full load power supply.

6.3 Power supply and distribution system

6.3.1 The medium-voltage distribution voltage level of production units should be 10kV.

6.3.2 According to its production scale and distribution of production units, the cold-rolled strip factory should set up power distribution systems in different areas, and the power distribution systems in each area should be as close to the load center as possible.

6.3.3 The main wiring of the power distribution system should adopt single busbar or single busbar section wiring, and the power distribution system should adopt radial type.

6.3.4 Power quality problems caused by electrical equipment should be managed by the power supply system in this area.

6.3.5 The design of relay protection and automatic devices shall comply with the relevant provisions of the current national standard "Code for Design of Relay Protection and Automatic Devices for Electric Power Installations" GB 50062.

6.4 Power supply and distribution lines

6.4.1 The design of cable distribution lines shall comply with the relevant provisions of the current national standard "Code for Design of Electric Power Engineering Cables" GB 50217.

7.1 Low-voltage power supply and distribution system

7.1.1 The electricity load of the cold-rolled strip factory shall be Class II or Class III, and some facilities with higher requirements for power supply safety may be Class I loads. The power supply and distribution system should meet the corresponding load classification requirements.

7.1.2 The power load level of fire-fighting equipment shall comply with the relevant provisions of the current national standard "Code for Fire Protection Design of Buildings" GB 50016.

7.1.3 The automatic control system, important testing instruments, switches and telephones of the IP communication system should use UPS power as the emergency power supply, and its backup time should meet the emergency treatment needs after the working power supply is cut off.

7.1.4 Lighting and cranes in the cold-rolled strip factory should be powered by dedicated transformers.

7.1.5 The design of the low-voltage power supply and distribution system shall also comply with the relevant provisions of the current national standard "Code for Design of Low-Voltage Power Distribution" GB 50054.

7.2 Electric drive

7.2.1 The electric drive system should adopt full AC drive mode. Motors that require speed regulation should be powered by full-digital AC frequency conversion speed regulation equipment.

7.2.2 The transmission motors in the production units that need frequency conversion and speed regulation should adopt the power supply mode of "public rectifier + inverter".

7.2.3 The transmission system of pumps and fans should adopt AC frequency conversion speed regulation system.

7.3 Electrical Engineering

7.3.1 The location of the electrical room should be close to the load center. For production units with large and dispersed electrical loads, it is advisable to set up multiple electrical rooms according to the load distribution.

7.3.2 For large electrical rooms, basements or cable interlayers should be set up.

7.3.3 For large-scale production units, cables should be laid in cable tunnels.

7.3.4 The air inlets of electrical rooms, operating rooms, and cable tunnels should avoid acid and alkali fog areas.

7.3.5 Electrical equipment, cables and cable laying materials arranged in areas with acid and alkali fog should adopt acid and alkali resistant materials or take other protective measures.

7.3.6 The cable design should comply with the relevant provisions of the current national standard "Code for Design of Electric Power Engineering Cables" GB 50217.

7.3.7 The fire protection design shall comply with the relevant provisions of the current national standards "Code for Fire Protection Design of Buildings" GB 50016 and "Code for Fire Protection Design of Iron and Steel Metallurgical Enterprises" GB 50414.

7.3.8 The lighting design shall comply with the relevant provisions of the current national standard "Architectural Lighting Design Standard" GB 50034.

7.3.9 The lightning protection design shall comply with the relevant provisions of the current national standard "Code for Lightning Protection Design of Buildings" GB 50057.

7.3.10 The grounding design shall comply with the relevant provisions of the current national standard "Type and Safety Technical Requirements for System Grounding" GB 14050.

7.3.11 The design of explosive and fire hazardous environments shall comply with the relevant provisions of the current national standard "Code for Design of Electrical Installations in Explosive and Fire Hazardous Environments" GB 50058.

8.1 General provisions

8.1.1 The configuration of testing instruments should be economical, reliable, practical and easy to maintain, based on the overall equipment level and control level of the production unit on the premise of meeting the requirements of the production process.

8.1.2 The analog signal for long-distance transmission should adopt 4mA~20mA DC signal.

8.2 Testing instrument equipment

8.2.1 Temperature instruments should meet the following requirements.

1 The graduation number of the thermal resistance should be Pt100; the thermocouples with the graduation numbers E, K, S, and B should be preferred according to the temperature measurement range;

2 Armored thermocouples should be used for temperature measurement of the radiant tube wall of the annealing furnace;

3 The inserting temperature measuring instrument should be inserted into the appropriate depth according to the diameter of the process pipe;

4.According to the characteristics of the measured medium, select the appropriate material for the protection tube of the temperature measuring element;

5 When the strip temperature needs to be continuously measured, an infrared pyrometer should be used.

8.2.2 For pressure gauges, appropriate liquid-contacting materials should be selected according to the corrosiveness of the measured medium. For highly corrosive acidic media, diaphragm-sealed pressure transmitters should be used.

8.2.3 The throttling device and electromagnetic flowmeter in the flow meter shall meet the following requirements.

1 The throttling device shall meet the following requirements.

1) Throttling devices should be used for gas and non-conductive liquid flow detection;

2) For the gas flow measurement with large temperature and pressure fluctuations, temperature and pressure compensation should be carried out;

3) The pressure taking and installation method of the throttling device shall comply with the relevant provisions of the current national standard GB/T 2624 "Using a differential pressure device installed in a circular cross-section pipe to measure the flow of a full pipe fluid".

2 The electromagnetic flowmeter shall meet the following requirements.

1) For the flow measurement of conductive liquid medium, electromagnetic flowmeter should be used first;

2) When the measured medium contains magnetic or magnetizable substances, electromagnetic flowmeters should not be used;

3) For alkaline medium, the electrode material should be stainless steel; for strongly corrosive acidic medium, the electrode material should be tantalum metal, and the lining material should be polytetrafluoroethylene;

4) For places with insufficient maintenance space or large vibrations, and when the measured medium is highly corrosive, a split electromagnetic flowmeter should be used.

8.2.4 Level instruments should meet the following requirements.

1 Under normal working conditions, the liquid density is prone to obvious changes...