CNC Machining Alloy Steel Parts
Alloy Steel Is An Iron-Carbon Alloy With Carbon Content Ranging From 0.0218% To 2.11%. It’s Also Called Carbon Steel. It Also Contains a Small Amount Of Silicon, Manganese, Sulfur And Phosphorus. Generally, The Higher The Carbon Content In Carbon Steel, The Greater The Hardness And Strength, But The Lower The Plasticity.
Classification
(1) Alloy Steel Can Be Divided Into Three Types According To Its Use: Carbon Structural Steel, Carbon Tool Steel And Free Cutting Structural Steel. Carbon Structural Steel Can Also Be Divided Into Engineering Construction Steel And Machine Manufacturing Structural Steel.
(2) According To The Smelting Method, It Can Be Divided Into Open-Hearth Steel And Converter Steel.
(3) According To Deoxidization Method, It Can Be Divided Into Boiling Steel (f), Killed Steel (z), Semi-Killed Steel (b) And Special Killed Steel (Tz).
(4) According To Carbon Content, Carbon Steel Can Be Divided Into Low Carbon Steel (Wc < 0.25%), Medium Carbon Steel (Wc 0.25% – 0.6%) And High Carbon Steel (Wc > 0.6%).
(5) According To The Quality Of Steel, Carbon Steel Can Be Divided Into Ordinary Carbon Steel (Containing Higher Phosphorus And Sulphur), High Quality Carbon Steel (Containing Lower Phosphorus And Sulphur), High Quality Steel (Containing Lower Phosphorus And Sulphur) And High Quality Steel (Containing Lower Phosphorus And Sulphur) And High Quality Steel.
Category
Alloy Structural Steel
Title: Example q235-a.f, Which Means_s = 235 Mpa.
Note: q Is Yield Strength a Quality Grade (Abcd Grade 4), f Boiling Steel.
Features: Low Price, Excellent Process Performance (Such As Weldability And Cold Formability).
Application: General Engineering Structure And Common Mechanical Parts. For Example, q235 Can Be Used To Make Bolts, Nuts, Pins, Hooks And Less Important Mechanical Parts, As Well As Threaded Steel, Profiled Steel, Reinforcing Steel In Building Structures.
High Quality Alloy Structural Steel
Brand: Example 45, 65mn, 08f.
Name Note: Indicates Directly The Ten Thousand Percent Carbon Content Of Metals.
Application: Non-Alloy Steel For Manufacturing Important Mechanical Parts Is Usually Used After Heat Treatment.
Common Steel Grades And Uses:
08f, Low Carbon Content, Good Plasticity, Low Strength, Used For Stamping Parts Such As Automobile And Instrument Housing;
20 Good Plasticity And Weldability. Used For Parts With Low Strength And Carburized Parts, Such As Hood, Welding Container, Small Axle, Nut, Washer And Carburized Gear.
45,40mn, With Good Comprehensive Mechanical Properties After Quenching And Tempering, Is Used For Mechanical Zero With Large Force.
Parts: Such As Gears, Connecting Rods, Machine Tool Spindles, Etc.
60mn And 65mn Steels Have High Strength And Are Used To Manufacture Various Springs, Wheel Flanges And Low-Speed Wheels.
Alloy Tool Steel
Brand: For Example, t12 Steel Represents Wc = 1.2% Carbon Tool Steel.
Name Note: t Plus Thousands Of Carbon Content Of Metal.
Characteristic: It Belongs To Eutectoid Steel And Hypereutectoid Steel. It Has High Strength, Hardness And Good Wear Resistance. It Is Suitable For Manufacturing Various Low-Speed Cutting Tools.
Common Steel Grades And Uses:
t7, t8: Making Parts That Bear Certain Impact And Require Toughness. Such As Hammer, Punch, Chisel, Woodworking Tools, Scissors.
t9, t10, t11: Manufacture Tools With Low Impact, High Hardness And Wear Resistance. Such As Taps, Small Drills, Dies, Hand Saw Blades.
t12, t13: Making Tools That Are Not Impacted. Such As Files, Scrapers, Razors, Measuring Tools.
Cast Alloy Steel
Brand: For Example, Zg200-400, Which Means Cast Steel With_s = 200 Mpa And_b = 400 Mpa.
Property: Casting Property Is Worse Than Cast Iron, But Mechanical Property Is Better Than Cast Iron.
Application: Mainly Used For Manufacturing Complex Shape, High Mechanical Properties, But It Is Difficult To Forge And Other Important Mechanical Parts, Such As Automobile Gearbox Housing, Locomotive And Vehicle Coupler And Coupling.
Alloy Steel Industry
(1) Production Has Reached An All-Time High.
From January To June 2013, The Total Production Of Crude Steel In China Was 390 Million Tons, An Increase Of 7.4% Over The Same Period a Year Ago, An Increase Of 5.6 Percentage Points Over The Same Period a Year Ago. In The First Six Months, The Average Daily Output Of Crude Steel Was 21.544 Million Tons, Equivalent To 786 Million Tons Of Crude Steel Annually. Among Them, In February It Reached The Highest Level Of 2.28 Million Tons In History. Although It Declined In March-June, It Still Maintained a High Level Of More Than 2.1 Million Tons. From January To June, The Output Of Crude Steel In Hebei And Jiangsu Increased By 6.8% And 13.2% Respectively Compared With The Same Period Last Year. The Total New Output Of The Two Provinces Accounted For 42.4% Of The Total Increase Of 26.94 Million Tons In China. In Addition, The Output Of Shanxi, Liaoning, Henan And Yunnan Provinces Increased By More Than 1 Million Tons. From January To June, Crude Steel Output Of Key Large And Medium-Sized Iron And Steel Enterprises Increased By 5.5% Year On Year, Which Was Lower Than The National Average Increase Of 2 Percentage Points, But Still 60% Of The Increase Came From Key Large And Medium-Sized Iron And Steel Enterprises.
(2) Low Price Operation Of Steel Products.
From January To June 2013, The Overall Performance Of The Domestic Steel Market Was Sluggish. With The Large-Scale Release Of Crude Steel Production Capacity, Market Supply And Demand Imbalance, Steel Prices Have Entered a Downward Channel, Has Been Weaker For More Than Four Months. As Of July 26, 2013, The Steel Price Index Dropped To 100.48, Down From 6.6 At The Beginning Of The Year. The Prices Of Eight Steel Products, Which Are Mainly Counted By The Iron And Steel Industry Association, Have Declined In Varying Degrees Compared With Those At The Beginning Of The Year, With An Average Decline Of 5.7%. In Terms Of Varieties, The Prices Of Construction Wire Rod And Threaded Steel, Which Account For a Large Proportion Of China’s Steel Output, Fell By 4.9% And 6.7% Respectively, While The Prices Of Medium And Heavy Plate And Hot Rolled Coil Plate Dropped By 5.7% And 9.7% Respectively.
(3) Steel Exports Grew Rapidly.
The Imbalance Between Supply And Demand In The Domestic Steel Market Stimulates The Export Of Enterprises. From January To June, China Exported 3.69 Million Tons Of Steel, An Increase Of 12.6% Over The Same Period Last Year; Imported 6.83 Million Tons Of Steel, a Decrease Of 1.8%, And Imported 320,000 Tons Of Billets And Ingots, An Increase Of 50%. Converting Billet Into Crude Steel, The Total Net Export Is 25.06 Million Tons, Up 17.3% Year-On-Year, Accounting For 6.4% Of China’s Crude Steel Output. In Terms Of Export Prices, The Average Export Price Of Bars And Wires In January-June Was 624.3 Us Dollars Per Ton, Down 18% From The Same Period Last Year, While That Of Sheets Was 835.2 Us Dollars Per Ton, Down 2.8% From The Same Period Last Year.
(4) High-Level Operation Of Steel Mills And Social Inventories.
The Contradiction Between Supply And Demand In The Market Has Spread To The Field Of Circulation, And Domestic Steel Stocks Continue To Grow At The End Of Last Year. On March 15, It Reached An All-Time High Of 22.22 Million Tons, An Increase Of 3.51 Million Tons Over The Previous Year’s Peak, Of Which 14.32 Million Tons Were In Construction Steel Stocks, Accounting For 63.6% Of The Total Stocks. Later, As Seasonal Consumption Increased, Inventories Gradually Fell To 15.4 Million Tons On July 26. Market Oversupply Also Pushed Up Steel Plant Inventory. In Mid-March, Key Enterprises’Steel Inventory Reached a Record 14.51 Million Tons, An Increase Of 29.7% Over The Same Period Last Year. In Late June, It Fell To 12.68 Million Tons, Still 29.9% Higher Than The Beginning Of The Year, And 11.4% Higher Than The Same Period In 2012.
(5) The Profit Level Of Steel Mills Is Declining Month By Month.
In The First Half Of 2013, The Profit Of Metallurgical Industry Reached 73.69 Billion Yuan, An Increase Of 13.7% Over The Previous Year. Among Them, The Profit Of Ferrous Metal Smelting And Calendering Industry Reached 45.44 Billion Yuan, An Increase Of 22.7% Over The Previous Year. From January To May, The Profit Situation Of Key Large And Medium-Sized Iron And Steel Enterprises Was Far Worse Than The Overall Level Of The Industry, And Showed a Downward Trend Month By Month. Although Profits Increased By 34%, But Only 2.8 Billion Yuan, The Sales Profit Rate Was 0.19%. In May, 86 Key Large And Medium-Sized Iron And Steel Enterprises Only Realized Profits Of 150 Million Yuan, Which Declined Annually For Five Consecutive Months. 34 Of Them Lost Money, With a Loss Of Up To 40%.
(6) The Growth Rate Of Investment In Fixed Assets In The Iron And Steel Industry Has Dropped Significantly.
From January To June 2013, The Investment In Fixed Assets Of Iron And Steel Industry Was 303.5 Billion Yuan, An Increase Of 4.3% Over The Same Period Of Last Year. Among Them, The Investment In Ferrous Metallurgy And Rolling Increased By 3.3% Over The Same Period Of Last Year, And Fell By 6.1 Percentage Points Over The Same Period Of 2012. The Investment In Ferrous Metals Mining And Processing Increased By 7.8% Over The Same Period Of Last Year, And The Growth Rate Dropped By 15 Percentage Points.