The following are specific standards (scrap steel standard (GB4223-2004)) for reference.
Scrap steel standard
The national scrapping standard was issued in 2004, and the original scrapping standard 1996 was also revoked.
The newly revised national standard "Scrap Steel" (GB4223-2004) issued by the General Administration of Quality Supervision, Inspection and Quarantine and the State Standardization Administration Committee was approved for release and officially implemented on June 5438+February 1 day, 2004.
These include:
The carbon content of scrap steel is generally less than 2.0%, and the sulfur content and phosphorus content are not more than 0.050%.
The residual elements in unalloyed scrap steel should meet the following requirements: the mass fraction of nickel is not more than 0.30%, the mass fraction of chromium is not more than 0.30%, and the mass fraction of copper is not more than 0.30%. Except for manganese and silicon, the total content (mass fraction) of other residual elements is not more than 0.60%.
Scrap steel is divided into smelting scrap steel and non-smelting scrap steel according to its use.
Scrap steel for smelting
Smelting scrap can be divided into five types according to its overall size and weight: heavy scrap, medium scrap, small scrap, comprehensive scrap and light scrap.
The positive deviation of various scrap sizes shall not be greater than 10%.
Smelting scrap is divided into non-alloy scrap, low-alloy scrap and alloy scrap according to its chemical composition. Refer to GB/T 13304 for non-alloy waste and low-alloy waste.
According to the chemical composition and the content of main alloying elements, smelting alloy wastes are divided into 6 steel grades and 46 steel grades, as shown in Appendix B.
Non-smelting scrap steel is no longer classified, which is determined by the agreement between the supplier and the buyer.
Standard for Scrap Steel (GB4223-2004)
The newly revised national standard "Scrap Steel" (GB4223-2004) issued by the General Administration of Quality Supervision, Inspection and Quarantine and the State Standardization Administration Committee was approved for release and officially implemented on June 5438+February 1 day, 2004.
Some contents are summarized as follows:
4 classification
Scrap steel can be divided into scrap iron and scrap steel.
4. 1 scrap iron
4. 1. 1 The carbon content of scrap iron is generally greater than 2.0%. The sulfur content (mass fraction) and phosphorus content (mass fraction) of high-quality scrap iron are not more than 0.07% and 0.40% respectively. The sulfur content (mass fraction) and phosphorus content (mass fraction) of common iron filings and alloy iron filings are less than 0. 12% and 1.00% respectively. The iron content of blast furnace additives should not be lower than 65.0%.
4. 1.2 scrap iron is divided into smelting scrap iron and non-smelting scrap iron according to its use.
4. 1.2. 1 scrap iron for smelting
4. 1.2. 1. 1 Scrap iron for smelting is classified by quality and shape. See table 1 for details.
Table 1 Classification of scrap iron for melting
A typical example of variety category
Code A B C
High-quality scrap iron 10 1 length ≤ 1000mm, width ≤500mm, height ≤300mm and weight ≤200kg. It is easy to become a kind of scrap iron after crushing and melting.
Raw iron powder (pig iron mixed with impurities at the end of raw iron chips)
And its cold-pressed pig iron mechanical parts and power transmission engineering.
Casting, cast iron roller, automobile cylinder block, engine shell, ingot mold, etc.
Ordinary scrap iron 102 cast iron pipeline, high phosphorus iron, high sulfur iron, coke iron, etc.
Alloy scrap iron 103 alloy roll, nodular roll, etc.
The external dimensions of blast furnace additive 104 shall be ≥10mmxlomm, ≤200mmX200mmX200mm, and the weight of a single piece shall be ≤5kg, which is used for processing briquettes.
4. 1.2. 1.2 The density of cold-pressed iron filings shall not be less than 3000kg/m3. In the process of transportation and unloading, the amount of scattered iron chips does not exceed 5% of the batch, and the briquette meets the shedding test.
4. 1.2. 1.3 Scrap iron other than the types and sizes specified in the table 1 can also be provided according to the agreement between the supplier and the buyer.
4. 1.2.2 Non-smelting scrap iron
Non-smelting scrap iron is no longer classified, which is determined by the agreement between the supply and demand sides.
4.2 scrap steel
4.2. 1 The carbon content of scrap steel is generally less than 2.0%, and the sulfur content and phosphorus content are not more than 0.050%.
4.2.2 Residual elements in unalloyed scrap steel shall meet the following requirements: the mass fraction of nickel is not more than 0.30%, the mass fraction of chromium is not more than 0.30%, and the mass fraction of copper is not more than 0.30%. Except for manganese and silicon, the total content (mass fraction) of other residual elements is not more than 0.60%.
4.2.3 Scrap steel is divided into smelting scrap steel and non-smelting scrap steel according to the purpose.
4.2.3. 1 smelting scrap steel
4.2.3. 1.65438+
Table 2 Classification of scrap steel for smelting
Typical examples of model, category, code, external dimensions, weight requirements and supply shape.
Heavy scrap steel
1 grade 201a ≤1000 mmx400 mm, thickness ≥40mm,
Unit weight: 40kg ~ 1500kg,
The diameter of the cylinder is greater than or equal to 80mm. Scrap ingots, billets, billets, cutting heads,
Tail cutting, steel castings, steel rollers, heavy machinery.
Mechanical parts, cutting structural parts, etc.
Type 2: 201b ≤1000 mmx500mm, thickness ≥25mm,
Unit weight: 20kg ~ 1500kg,
The diameter of the cylinder is greater than or equal to 50 mm. Scrap ingots, billets, billets, cutting heads,
Tail cutting, steel castings, steel rollers, heavy machinery.
Mechanical parts, cutting structural parts, wheel shafts,
Waste industrial equipment and so on.
Class 3: 201c ≤1500mm x 800mm, thickness ≥ 15mm,
Unit weight: 5 kg ~ 1500 kg,
The diameter of cylindrical solid is greater than or equal to 30 mm. Waste ingots, billets, billets, cutting heads,
Keywords tail cutting, steel casting, steel roller, train shaft,
Track, pipeline, heavy machinery parts, cutting
Structural parts, axles, abandoned industrial equipment, etc.
Medium scrap steel
1 type 202A ≤ 1000mmX500mm, thickness ≥ 10mm,
Unit weight: 3 kg ~ 1000 kg,
The diameter of that cylindrical solid body is great than or equal to 20mm. Scrap billets, steel products, vehicle and boat plates and machinery in blocks, strips, plates and shapes.
Scrap steel parts, mechanical parts, cutting structural parts,
Train shafts, rails, pipelines, abandoned industrial equipment, etc.
Type 2 202b ≤1500mx700mm, thickness ≥6mm,
Unit weight: 2kg ~ 1200kg,
The diameter of cylindrical solid is ≥ 12mm. Waste steel billets, steel products, vehicle and boat plates and machines, in blocks, strips, plates and shapes.
Scrap steel parts, mechanical parts, cutting structural parts,
Train shafts, rails, pipelines, abandoned industrial equipment, etc.
Small scrap steel
1 grade 203A ≤ 1000mmX500mm, thickness ≥4mm,
Unit weight: 0.5 kg ~ 1000 kg,
The diameter of cylindrical solid is ≥ 8 mm Block, strip, plate, type mechanical waste parts, mechanical parts, vehicles and boats.
Plate, pipeline, waste equipment, etc.
Class 2, Grade 203B I: density ≥ 1 100 kg/m3,
Grade II: density ≥ 800kg/m3. Broken materials, automobile broken materials, etc.
Single scrap steel -204 ≤ 1000mx800mm, thickness ≥2mm,
Unit weight: ≤800kg,
The diameter of cylindrical solid is ≥ 4 mm Block, strip, plate, type mechanical waste parts, mechanical parts, vehicles and boats.
Plate, waste equipment, pipe, steel strip, scrap, etc.
Light scrap steel
1 type 205a ≤1000 MMX1000 mm, thickness ≥2mm,
Unit weight: ≤ 100kg. Blocks, strips, plates, various types of mechanical wastes and mixed wastes, pipes,
Plate, steel wire, scrap, production and
Life scrapping, etc.
Class 2: 205B ≤800mmx600mmX500mm,
Grade I: density ≥ 2500kg/m3,
Grade II: density ≥ 1800kg/m3,
Grade III: density ≥ 1200kg/m3. All kinds of mechanical wastes and mixed wastes, plates and edges are packed.
Scrap, steel wire, production and living waste, etc.
4.2.3. 1.2 The positive deviation of various scrap sizes should not be greater than 10%.
4.2.3. 1.3 Scrap steel for smelting can be divided into non-alloy scrap steel, low-alloy scrap steel and alloy scrap steel according to chemical composition. Refer to GB/T 13304 for non-alloy waste and low-alloy waste.
4.2.3. 1.4 Alloy scrap for smelting is divided into 6 steel grades and 46 steel groups according to chemical composition and main alloy element content, as shown in Appendix B.
Non-smelting scrap steel in 4.2.3.2 should not be classified, but should be determined by agreement between the supplier and the buyer.
5 technical requirements
5. 1 Scrap steel must be classified.
5.2 The overall dimension of a single piece of scrap iron and steel shall not be greater than 1500mm, and the weight of a single piece shall not be greater than 1500kg.
5.3 For scrap iron and steel with rust on the surface of a single piece, the thickness of rust attached to each surface shall not be greater than 10% of the thickness of the single piece.
5.4 Scrap steel should not be mixed with ferroalloy and harmful substances; Non-alloy scrap and low-alloy scrap should not be mixed with alloy scrap and scrap iron; Alloy scrap shall not be mixed with non-alloy scrap, low-alloy scrap and scrap iron. Scrap iron cannot be mixed with scrap steel.
5.5 There should be no dirt, cement, sand, oil stain and enamel on the surface of scrap steel and inside of equipment and packaging.
5.6 It is forbidden to mix bombs, shells and other explosive weapons and ammunition and other inflammable and explosive articles into scrap iron. It is forbidden to mix pipes with closed containers with closed ends. It is forbidden to mix rubber and plastic products.
5.7 There should be no complete sets of machinery, equipment and structural parts in the iron filings (if there are, they must be disassembled, crushed or flattened into irrecoverable shapes). All containers (cans, etc.). ) should be cut from the axial direction. Mechanical parts containers (engine, gearbox, etc.). ) Flammable crystals and lubricant residues should be removed.
5.8 It is forbidden to mix hazardous wastes whose concentration of harmful substances in leachate exceeds the identification standard value in GB 5085.3 with iron filings.
5.9 It is forbidden to mix inclusions in iron filings whose leaching solution exceeds the standard value in GB 5085. 1, that is, the pH value is not less than 12.5 or not more than 2.0.
5. 10 It is forbidden to mix harmful substances with PCB content exceeding the control standard value of GBl30 15 in scrap iron.
5. 1 1 Containers, pipes and their fragments used to hold liquid and semi-solid chemicals in steel must be cleaned. The import of scrap iron and steel must declare to the inspection agency the main components of chemicals and their fragments that have been packed in containers, pipelines or transported.
5. 12 scrap iron should not be mixed with the following harmful substances;
-Medical wastes, waste drugs and medical clinical wastes;
Pesticide and herbicide wastes and wastes containing wood preservatives;
-Waste emulsifier and organic solvent waste;
-Refining (steaming) distillation residues and incineration residues;
-Waste of photosensitive materials;
Wastes of beryllium, hexavalent chromium, arsenic, selenium, cadmium, antimony, tellurium, mercury, thallium, lead and their compounds, and wastes containing fluorine, cyanide and phenolic compounds;
Asbestos waste;
-Kitchen garbage, toilet garbage, etc.
5. 13 It is forbidden to mix radioactive waste into scrap iron.
Radioactive pollution of scrap steel shall be controlled according to the following requirements:
—— The penetrating radiation dose rate of external irradiation of scrap steel should not be higher than 0.46 μ SV/h;
Scrap steel The detection value of surface radioactive pollution level shall not exceed 0.04 bq/cm2；; The detection value of radioactive pollution level on β surface shall not exceed 0.4 bq/cm2；;
-The specific activity of radionuclides in iron filings is forbidden to exceed GBl6487.6.
5. 14 The total weight of nonmetallic inclusions (excluding nonmetallic hazardous wastes) in scrap iron of each inspection lot shall not exceed five thousandths of the weight of the inspection lot.
5. 15 Abandoned weapons shall be disposed of according to relevant regulations after technical safety inspection by the supplier.
5. 16 After being used, the performance indexes of non-smelted waste steel products meet the provisions of relevant standards, and should not cause hidden dangers or harm to public personal safety, property and environmental protection.
6 inspection items and inspection methods
6. 1 inspection items
6. 1. 1 Sampling inspection of overall dimensions, weight and thickness of single piece.
6. 1.2 inclusion and cleanliness inspection.
6. 1.3 Inspection of harmful substances and radioactive substances.
6. 1.4 Spot check of chemical elements such as sulfur, phosphorus, chromium, nickel, molybdenum, tungsten, manganese and copper.
6. 1.5 package drop test.
6. 1.6 Inspection of other items in scrap iron shall be spot-checked according to the actual situation of the arrival batch.
6.2 inspection method
6.2. 1 The sampling method of the samples required for inspection shall be determined through consultation between the supplier and the buyer.
6.2.2 Article 5.8 of this standard shall be inspected according to the provisions of GB 5085.3.
6.2.3 Article 5.9 of this standard shall be inspected according to the provisions of GB 5085.438+0.
6.2.4 The inspection of Article 5. 10 of this standard shall be conducted according to the provisions of GBl30 15.
6.2.5 The inspection of Article 5. 13 of this standard shall be carried out in accordance with the provisions of SN 0570.
6.2.6 Scrap steel samples are prepared according to GB/T 222- 1984, and scrap iron samples are prepared according to GB/T 7 19. Chemical analysis shall be conducted in accordance with the provisions of Appendix A or general methods, but arbitration analysis shall be conducted in accordance with the relevant provisions of Appendix A. ..
6.2.7 The types, cleanliness, inclusions, overall dimensions, single weight and other items of scrap steel shall be determined by inspection means, such as weighing instruments and tape measures or other inspection means.
6.2.8 Drop test of package (coal cake):
Randomly select 5 packs (briquetting) from an acceptance batch. Packaged parts (coal balls) fall three times (freely) from the position higher than the metal plate or cement plate1.5m. At this time, there should be no falling objects larger than its weight 10%.
7 acceptance rules
7. 1 The buyer can conduct spot checks on each batch of scrap steel. A delivery batch can be divided into multiple inspection lots for acceptance.
7.2 Each inspection lot shall consist of scrap steel of the same model, category and steel group or brand (alloy steel).
7.3 After the acceptance of each batch of delivered scrap steel, the weight of impurities such as inclusions and rust shall be deducted.
8 transport and quality certificate
8. 1 When loading (ship), each carriage (cabin and container) is generally only allowed to load scrap steel of the same model (category) and steel group (alloy steel). In order to make up for the loading of carriages (cabins, containers), more than two types (categories) and steel scrap can also be loaded, but they should be isolated and clearly marked, and they should not be mixed.
8.2 When delivering scrap steel, each batch of delivery must be accompanied by a quality certificate, and imported scrap steel must be accompanied by a radioactive inspection certificate. The quality certificate shall indicate the name of the supplier, the type and category of scrap steel, the weight of each batch, the steel group of alloy scrap steel and the corresponding chemical composition.