Analysis: Plate Purchase of common sense

First, steel (including steel) Classification:

1, according to the thickness of the categories: (1) sheet (2) in the plate (3) plate (4) special plate

2, according to the production method of classification: (a) hot-rolled steel (2) cold-rolled steel

3, according to the classification of surface features: (1) galvanized (hot galvanized plate, galvanized sheet) (2) tin plate

(3) composite plate (4) color coated steel

4, according to uses: (1) bridge plate (2) boiler plate (3) shipbuilding steel plate (4) armor plate

(5) automotive steel (6) roof plate (7) Structural Steel (8) electrical steel (silicon steel)

(9) spring plate (10) Other

Second, the general and common mechanical structure with steel grades in Japan

1, the Japanese steel (JIS series) grades in the general structural steel is mainly composed of three parts, said first part of the material composition.

Such as: S (Steel) said steel, F (Ferrum) represents iron; the second portion of said different shapes, types, uses, such as P (Plate) said plate, T (Tube) said tube, K (Kogu) said tool; The third part features a digital representation, usually a minimum tensile strength. Such as: SS400 - S represents the first steel (Steel), said second S "configuration" (Structure), 400 to lower the tensile strength of 400MPa, a tensile strength of said overall general structural steel of 400 MPa.

2, SPHC - the first steel Steel acronym S, P is the acronym plate Plate, H is the heat Heat acronym, C Commercial Commercial abbreviation overall general said hot-rolled steel sheet and strip.

3, SPHD - said the press hot-rolled steel sheet and strip.

4, SPHE - expressed deep drawing hot rolled steel sheet and strip.

5, SPCC - indicates a general cold rolled carbon steel sheet and strip, equivalent to China Q195-215A grades. Where C is the third letter abbreviations Cold Cold. When the need to ensure tensile test, plus at the end of grade T is SPCCT.

6, SPCD - said drawing cold rolled carbon steel sheet and strip, equivalent to China 08AL (13237) quality carbon structural steel.

7, SPCE - expressed deep drawing cold rolled carbon steel sheet and strip, equivalent to China 08AL (5213) deep drawing steel. The need to ensure non-aging, the increase in grades at the end of N is SPCEN. Cold-rolled carbon steel sheet and strip quenched Code: annealed state A, the standard quenching of S, 1/8 hard to 8,1 / 4 hard to 4,1 / 2 Hard 2, the hard one. Surface processing code: matt finishing is D, bright finishing as B. If SPCC-SD represents the standard quenched, rolled carbon sheet matt finishing. Again SPCCT-SB represents the standard conditioning, bright processing, required to ensure the mechanical properties of cold-rolled carbon sheet.

8, JIS mechanical structural steel grades that method is:

S + carbon + letter code (C, CK), with a median value of which carbon × 100, said the letter C: carbon K: said carburizing steel. If carbon structural steel coil S20C carbon content of 0.18-0.23%.

Third, China and Japan silicon steel grades representation

1, China grades representation:

(1) cold-rolled non-oriented silicon steel strip (sheet)

Representation: DW + iron loss (in the frequency of 50HZ, sine wave peak magnetic induction unit weight of iron loss value of 1.5T) + 100 times 100 times the thickness values. If DW470-50 said iron loss value 4.7w/kg, thickness of 0.5mm cold-rolled non-oriented silicon steel, is the new model is represented as 50W470.

(2) Cold-rolled grain oriented silicon steel strip (sheet)

Representation: DQ + iron loss (in the frequency of 50HZ, sine wave peak magnetic induction unit weight of iron loss 1.7T) + 100 times 100 times the thickness values. Sometimes the iron loss value plus G represents a high magnetic induction. If DQ133-30, said iron loss value of 1.33 and a thickness of 0.3mm cold-rolled grain oriented silicon steel strip (sheet), the new model is now expressed as 30Q133.

(3) Hot-rolled silicon steel sheet

Hot-rolled silicon steel sheet with DR said, according to the number of silicon content into low silicon (silicon content ≤ 2.8%), high silicon steel (silicon content> 2.8%).

Representation: DR + iron loss value (50HZ repeatedly magnetized with a sine-shaped variation, and the magnetic induction intensity maximum weight per unit time of the iron loss value 1.5T) + 100 times 100 times the thickness. DR510-50 expressed as the iron loss value of 5.1, the thickness of hot-rolled silicon steel sheet of 0.5mm. Household appliances, hot-rolled silicon steel sheet grade iron loss by JDR + + thickness values expressed as JDR540-50.

2, Japan grades representation:

(1) cold-rolled non-oriented silicon steel strip

The nominal thickness (expanded 100-fold value) + Code A + iron loss guaranteed (the frequency 50HZ, the maximum value of the magnetic flux density of 1.5T iron loss when enlarged 100 times after).

If 50A470 represents the thickness of 0.5mm, iron loss guarantee value ≤ 4.7 cold rolled non-oriented silicon steel strip.

(2) Cold-rolled grain oriented silicon steel band

The nominal thickness (expanded 100-fold value) + Code G: said common materials, P: indicates highly oriented material + iron loss guaranteed (will expand to 100 times the frequency of 50HZ, the maximum flux density of 1.7T when iron loss the value).

If 30G130 represents the thickness of 0.3mm, cold-rolled iron loss guarantee oriented silicon steel strip is ≤ 1.3.

Fourth, tinplate and galvanized sheet:

1, tinplate

Tin plated steel sheet and strip, also known as tinplate, this plate (with) a tin-plated, with good corrosion resistance, and non-toxic, can be used as canned packaging materials, inside and outside the cable sheathing, instrumentation Telecommunications parts, flashlight and other hardware.

2, hot galvanized plate

Sheets and strip surface in a continuous hot-dip zinc plated to prevent corrosion of the steel sheet and strip surface rust. Galvanized steel sheets and strips are widely used in machinery, light industry, construction, transportation, chemicals, telecommunications and other industries.

Five killed steel plate and boiling

A boiling plate is made of ordinary carbon steel rimmed steel rolled into plate. Boiling complete deoxidation of steel is a steel with only a weak amount of deoxidizer for deoxidizing molten steel, the higher the oxygen content of the molten steel when the molten steel into the ingot mold, produce large amounts of carbon and oxygen reaction gas, resulting in the boiling liquid steel , boiling steel thus named. Low boiling steel carbon content, because they are not ferrosilicon oxygen, silicon steel is also low (Si<0.07%). Boiling steel outer layer is in the boiling liquid steel churning caused crystallization conditions, so the surface of pure, dense, good surface quality, good ductility and stamping performance, no major concentration of shrinkage, cut head less finished product rate, and boiling steel production process is simple, low alloy consumption, low cost of steel. Boiling steel is used extensively for the manufacture of various stamping parts, construction and engineering structures and some of the less important parts of the machine structure. But boiling steel core part of impurities, segregation is more serious, the organization is not dense, uneven mechanical properties. While higher gas content in the steel, the low toughness, greater sensitivity to cold brittle and aging, welding performance is also poor. It is not suitable for the manufacture of boiling steel to withstand impact loads, welded construction work at low temperatures and other important structures.

2, sedation sedation steel plate made of ordinary steel hot-rolled carbon steel. Killed steel is completely deoxidized steel, molten steel before casting fully deoxygenated with ferromanganese, ferrosilicon and aluminum, steel liquid oxygen content is low (typically 0.002-0.003%), liquid steel ingot mold in the more calm, no boiling, killed steel hence the name. Under normal operating conditions, no bubbles killed steel, homogeneous dense; because low oxygen, low oxide inclusions in steel, high purity, low tendency to cold brittleness and aging; while smaller segregation killed steel, relatively uniform properties and high quality. Disadvantages killed steel is concentrated shrinkage, finished product rate, the higher the price. Therefore, sedation steel is mainly used for high components, welded structures and other components required strength to withstand the impact of lower temperatures. Low-alloy steel plate are killed steel and semi-killed steel plate. Due to the high strength, superior performance, can save a lot of steel, to reduce the weight of the structure, its application has become increasingly widespread.

Six high-quality carbon structural steel

Quality carbon structural steel is the carbon content of less than 0.8% of carbon steel, the steel contained sulfur, phosphorus and non-metallic inclusions in steel less than the carbon structure, the more excellent mechanical properties. According to carbon content can be divided into three categories: low-carbon steel (C ≤ 0.25%), medium carbon steel (C is 0.25-0.6%) and high carbon (C> 0.6%); quality carbon structural steel by including Different amounts of manganese into normal manganese content (0.25% -0.8% manganese) and high manganese content (0.70% -1.20% manganese) groups, which has good mechanical and processing properties.

1, high-quality carbon structural steel hot rolled steel sheet and strip

Quality carbon structural steel hot rolled steel sheet and strip for the automotive, aerospace and other industrial sectors. Its steel grades for rimmed steel: 08F, 10F, 15F; killed steel:. 08,08 AL, 10,15,20,25,30,35,40,45,50 25 and 25 The following is a low-carbon steel, 30 and 30 or more for the carbon steel plate.

2, high-quality carbon structural steel plates and wide strips

Quality carbon structural steel plates and wide strips for various mechanical structures. Its low carbon steel grades include: 05F, 08F, 08,10 F, 10,15 F, 15,20 F, 20,25,20 Mn, 25Mn, etc.; carbon steel include: 30,35,40,45,50, 55,60,30 Mn, 40Mn, 50Mn, 60Mn, etc.; high carbon steel include: 65,70,65 Mn and so on.

Seven special structural steel

A pressure vessel steel plate: grade with a capital R in the end, said its yield point can also be used brands available carbon or alloy containing element represents. Such as: Q345R, Q345 as the yield point. Another example: 20R, 16MnR, 15MnVR, 15MnVNR, 8MnMoNbR, MnNiMoNbR, 15CrMoR etc with carbon or alloy containing elements to represent;

2, welded steel gas cylinders: uppercase HP said at the end of grade, the grade can be expressed by the yield point, such as: Q295HP, Q345HP; containing alloying elements can also be expressed as: 16MnREHP.

3, boiler plate: lowercase g expressed in grades tail. Its yield point, said brands available, such as: Q390g; also available with carbon or alloy elements to represent, such as 20g, 22Mng, 15CrMog, 16Mng, 19Mng, 13MnNiCrMoNbg, 12Cr1MoVg so on.

4, bridge steel: lowercase q in grades tail said that if Q420q, 16Mnq, 14MnNbq so on.

5, automobile frames with steel: with a capital L, said at the end of grades, such 09MnREL, 06TiL, 08TiL, 10TiL, 09SiVL, 16MnL, 16MnREL so on.

Eight color coated steel

Color coated steel sheet and strip is a metal strip as the base, on its surface coated with various types of organic coatings products for construction, home appliances, steel furniture, transport and other fields.

Nine, hull structural steel

Shipbuilding steel generally refers to the hull structural steel, which refers to the construction specifications produced by the classification society for the manufacture of steel hull structure. Often as a special steel orders, scheduling, sales, including a boat ship, steel and so on.

(A) varieties and specifications

Hull structural steel division in accordance with the minimum yield strength level points are: general strength structural steel and high-strength structural steel.

China Classification Society standards in general strength structural steels are divided into: A, B, D, E four quality grade; China Classification Society standards in high-strength structural steel for the three intensity levels, four quality levels.

(B) the ship steel delivery acceptance note:

1, quality certification review:

Delivery of certain steel according to the user's requirements according to the contract specifications for the original delivery and quality certificates. Certificate, you must have the following:

(1) regulatory requirements;

(2) the quality of the record number and proof certificate number;

(3) furnace batch, technical grade;

(4) the chemical composition and mechanical properties;

(5) Classification Society surveyor recognized certificates and signatures.

2, physical examination:

Delivery of marine steel, real objects on the proper plant signs. Specifically:

(1) Classification Society approval mark;

(2) the use of paint or paste out of the box labeled, including technical parameters such as: heat number, specification standard grade, length and width dimensions, etc.;

(3) the appearance of smooth smoothly, without defects.

Ten, 1550 naming grades of cold rolled products

(A) cold rolling steel grades stamping naming

1, the general stamping steel: BLC

B - Baosteel (BAOSTEEL) abbreviation; L - Low Carbon (Low Carbon); C - general use (Commercial)

2, anti-aging low yield steel: BLD

B - Baosteel (BAOSTEEL) abbreviation; L - Low Carbon (Low Carbon); D - stamping (Drawing)

3, non-aging deep drawing steel: BUFD (BUSD)

B - Baosteel (BAOSTEEL) abbreviation; U - Super (Ultra); F - molding (Formability);

D - stamping (Drawing)

4, non-aging super-deep drawing steel: BSUFD

B - Baosteel (BAOSTEEL) abbreviation; SU - Super Senior (Ultra + Super); F - molding (Formability);

D - stamping (Drawing)

(B) the cold forming of high strength cold rolling steel grades naming

B × × × × ×

B - Baosteel (BAOSTEEL) abbreviation; × × × - minimum yield point value;

× - generally with V, X, Y, Z represents

V: High-strength low-alloy, the difference between the yield point and tensile strength are no provisions

X: V the yield point of difference between the minimum and the minimum tensile strength of 70MPa

Y: V the yield point of difference between the minimum and the minimum tensile strength of 100MPa

Z: V the yield point of difference between the minimum and the minimum tensile strength of 140MPa

× - oxide / sulfide inclusions Control (K: calm, fine grain; F: K + sulfide control; O: K, F outside)

Example: B240ZK, B340VK

(C) the dent resistance of cold rolling steel grades naming

B × × × × ×

B - Baosteel (BAOSTEEL) acronym

× × × - minimum yield point value

× - enhanced mode (P: strengthening; H: bake-hardening)

× - represented by a 1 or 2 (1: ultra-low carbon; 2: Low Carbon)

Example: B210P1: deep drawing high-strength steel; B250P2: general machining of high-strength steel with phosphorus; B180H1: deep red with a bake-hardening steels