Why is Q355GNH steel plate corrosion-resistant?

Q355GNH steel to GB/T 4171 weathering steel standard
Q355GNH steel plate chemical composition
Carbon0.12 max., Silicon0.25-0.75, Manganese 1.00 max. , Phosphorus 0.07-0.15, Sulfur 0.020 max., Copper 0.20-0.55, Chromium0.30-1.25, Nickel 0.65 max.


Why is Q355GNH steel plate corrosion-resistant?
The addition of phosphorus, copper, chromium, nickel and other trace elements to the steel will form a dense and highly adherent protective film on the surface of the steel, hinder the spread and development of rust, and protect the substrate below the rust layer to slow its corrosion rate. An amorphous spinel oxide layer of about 50 μm to 100 μm thick formed between the rust layer and the substrate is dense and has good adhesion to the base metal. The presence of this dense oxide film prevents oxygen and The infiltration of water into the steel substrate slows down the development of rust into the steel material and greatly improves the atmospheric corrosion resistance of the steel material. Weathering steel is a steel system that can be used thinner, barely used, or simplified coating, which makes the product prolonged corrosion resistance, save labor and reduce consumption, and upgrade. It is also a modern metallurgical new mechanism, new technology, and new process. Continuous development and innovative steel systems.
Done is better than perfect.

Comments

Post a Comment

Popular posts from this blog

GB/T 1591 -2018 Q355B steel,Q355 steel

GB/T 1591 -2018 Q355B steel is a new Chinese steel grade of Q345B Low Alloy High Strength Structural Steel. The material density is 7.85 g/cm3.  Q355B plates can be delivered in as rolled, normalized or normalizing rolling, thermomechanical processed condition.  According to GB/T 1591 -2018, Q355 steel has 3 quality levels: Q355B, Q355C and Q355D. “Q” is the first letter of Chinese Pinyin: “qu fu dian”, which means Yield Strength, “355” is the minimum value of yield strength 355 MPa for steel thickness ≤16mm, and tensile strength is 470-630 Mpa. Email: bebon.steel@outlook.com Q355 Steel Chemical Composition (Hot rolled) Steel Grade Quality Grade C % (≤) Si % (≤) Mn (≤) P (≤) S (≤) Cr (≤) Ni (≤) Cu (≤) N (≤) Mo (≤) B (≤) Nb (≤) V (≤) Ti (≤) Q355 Q355B 0.24 0.55 1.6 0.035 0.035 0.30 0.30 0.40 0.012 – – – – – Q355C 0.20 0.030 0.030 0.012 Q355D 0.20 0.025 0.025 – Q355 Steel Mechanical Properti
Read more

42CrMo4 steel vs 42CrMoS4 steel

Image
Both 42CrMo4 steel and 42CrMoS4 steel are alloy steel hardened and tempered plates under EN 10083-3 standard. There are little differences between 42CrMo4 steel and 42CrMoS4 steel plate. Below are the technical requirements comparison for your reference. 42CrMo4 steel and 42CrMoS4 steel chemical composition(%) Grades Material no. C Si max. Mn P  max. S Cr Mo 42CrMo4 1.7225 0.38 - 0.45 0.40 0.60 - 0.90 0.025 max. 0.035 0.90 - 1.20 0.15 - 0.30 42CrMoS4 1.7227 0.38 - 0.45 0.40 0.60 - 0.90 0.025 0.020 - 0.040 0.90 - 1.20 0.15 - 0.30 42CrMo4 steel vs 42CrMoS4 steel hardness in quenched condition Steel Grade Range limits HRC Hardness Measured From The Quenched End Of The Test Tube (MM) symbolic 1,5 3 5 7 9 11 13 15 20 25 30 35 40 45 50 42CrMo4 max 61 61 61 60 60 59 59 58 56 53 51 48 47 46 45 42CrMoS4 min 53 53 52 51 49 43 40
Read more

1Cr6Si2Mo heat-resistant steel

1Cr6Si2Mo steel is a martensitic heat-resistant steel with good oxidation resistance at 800℃. Compared with 1Cr5Mo steel, the Si content is 1.5% more, which makes the temper brittleness tendency of the 1Cr6Si2Mo steel increase, and the parts will produce brittle fracture when working at high temperature for a long time. The steel has good corrosion resistance in sulfur-containing oxidizing atmosphere and hot petroleum medium. Chemical Composition(%) C≤0.08 Si:1.5-2.0 Mn≤0.37 P≤0.014 S≤0.001 Cr:4.0-6.0 Mo:0.45-0.6 Ni≤0.04 Mechanical properties Yield strength: 401Mpa; Tensile strength: 547Mpa; Elongation: 31.5% After normalizing and tempering heat treatment, 1Cr6Si2Mo heat-resistant steel has higher endurance strength and creep strength. The steel has an air quenching phenomenon. After hot working, if it is cooled too quickly, cracks will occur and it should be cooled slowly. Weldability is poor, electric welding can be used, gas welding is not suitable, preheating to 300
Read more

BS700 high strength steel

Image
BS700MC steel, which we usually call high-strength steel, is also called steel for boom. This material is mainly used for large truss crane boom, etc. BS700 high strength steel available sizes Thickness : 2.5-14mm Width : 850-1600mm Length : 2000-12000 Shapes: plates, sheets, and strips According to customer requirements, the rolling width can also be set. The general width is mainly 1500MM and 1250MM. Price range: depending on market demand BS700 high strength steel technical data BS700 steel chemical composition : Grade C Mn Si P S Alt Nb V Ti Mo B BS700 ≤0.12 ≤2.10 ≤0.60 ≤0.025 ≤0.015 ≤0.015 ≤0.09 ≤0.20 ≤0.22 ≤0.50 ≤0.005 BS700 steel sheet Physical properties   Grade Yield Strength(MPa) tensile strength Elongation 180°bend BS700 700 750-950 10 d=2a BS700 Delivery status: BS series adopt high-strength steel-rolled (TMCP) delivery. BS700 high strength steel features BS700 belongs
Read more

Tempered high-strength steel WQ890D, WQ890E

Image
WQ890D, WQ890E steel for construction machinery Tempered high-strength steel grades: WQ890D, WQ890E, WQ960D and WQ960E What does  WQ890D stands for?  WQ890 steel plate is a quenched and tempered high-strength steel plate. Name representation method: W-the first pinyin of Chinese Wu; Q is the yield strength, 890 is the yield strength value in MPa; D is the steel quality grade is D, D The impact of the steel plate is -20. The common steel plate quality grades are D and E, namely WQ890D and WQ890E. Technical data of  WQ890D, WQ890E plates chemical composition(%) of WQ890D and WQ890E steel plates C Si Mn P S Mo Nb B Ni Cr Ti V Ceq ≤ 0.18 ≤ 0.50 ≤ 1.30 ≤ 0.020 ≤ 0.010 ≤ 0.60 ≤ 0.07 ≤ 0.003 ≤ 1.20 ≤ 0.09 ≤ 0.03 ≤ 0.08 ≤ 0.6 Mechanical properties of WQ890D and WQ890E steel plates Grade Thickness mm Rp0.2，Mpa Rm Mpa A% Impact energy AKV Temperature℃ J C 10-50 ≥ 890 ≥ 970 ≥ 12 0 ≥34 D
Read more

BS600MCK4 high strength steel application

Image
The BS series of high-strength steels are low-carbon and low-alloy structural steels with good weldability and cold formability. BS600MCK4 high strength steel sheets can be widely used in manufacturing industries such as construction machinery, vehicle structure, and container. BS600MCK4 high strength steel available sizes Thickness : 2.5-14mm Width : 850-1600mm Length : 2000-12000 Shapes: plates, sheets, and strips According to customer requirements, the rolling width can also be set. The general width is mainly 1500MM and 1250MM. Price range: depending on market deman d BS600MCK4 steel technical data     BS600MCK4 steel   chemical composition : Grade C Si Mn P S Alt B BS600MCK4 ≤0.12 ≤0.50 ≤2.0 ≤0.015 ≤0.005 ≥0.015 ≤0.005 Good Weldability --- carbon equivalent(Ceq) and weld crack sensitivity index(Pcm) Grade Performance carbon content C（%） Performance carbon content Ceq Welding sensitivity index performance Pcm
Read more

P235GH boiler steel plate spot to EN 10028-2

Image
A s a professional EN 10028-2 P235GH   boiler steel s upplier , we have a lot of EN 10028-2 P235GH steel plates  in stock. Our  service has already spread many countries in Europe, America, Southeast Asia, Middle East, South America, Africa, and so on.   EN 10028-2 P235GH   S teel P late Application EN 10028-2 P235GH  steel has the proper tensile strength, good toughness, low effectiveness of the tendency, plasticity, processing property, be rolled into steel plates, shaped steel and profile steel, which usually used to build workshop, bridge, vessels and so on. Category: Boiler steel Standard: EN 10028-2 Grades: P235GH EN 10028-2 P235GH   S teel P late  Available Size: T hickness: 5-300mm    Width: 1500-4200mm    Length: 4000-18000mm D elivery condition :  hot rolled, control rolled, or normalized.   Packing detail: Standard export packing or according to customer's request Price terms: FOB, CNF, CIF Payment terms: T/T, L/C KING STEEL has spec
Read more