Super High Strength Gas Shielded Welding Wire Composition
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Solution Overview
Problem
High-strength steel welding materials with high carbon equivalent and microalloy elements result in poor crack resistance and increased costs, while achieving high tensile strength and toughness is challenging, especially with the addition of expensive elements like Ni and Re.
Innovation Solution
A superhigh strength gas shielded welding wire with controlled chemical composition, including C: 0.06-0.12%, Si: 0.55-0.80%, Mn: 1.60-1.95%, Cu: 0 ≤ 0.20%, Cr: 0.10-0.35%, Mo: 0.10-0.50%, Ni: 1.00-1.60%, Ti: 0.01-0.20%, B: 0.0005-0.006%, and no microalloy elements like W and Re, to achieve a balance of strength, toughness, and plasticity with reduced carbon equivalent and production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If microalloy elements (W, Re) and high Ni content are added to improve tensile strength, then strength increases, but cost increases significantly and low temperature impact toughness decreases
Solution Approach 1:
The patent optimizes the chemical composition parameters by strictly controlling C (0.06-0.12%), Si (0.55-0.80%), Mn (1.60-1.95%), and other alloying elements within specific ranges. This parameter optimization achieves the desired strength-toughness balance without requiring excessive Ni (1.00-1.60% only) or expensive microalloy elements, thereby improving low temperature impact toughness while maintaining tensile strength
Solution Approach 2:
The patent replaces expensive long-term alloying elements (Ni ≥2%, W, Re) with a more economical composition strategy using moderate Ni content (1.00-1.60%) combined with optimized Si and Mn content. This substitution reduces material cost while achieving the required mechanical properties through balanced composition rather than heavy reliance on expensive elements
2Strength
If main alloying elements are increased to achieve high strength grade (≥80 kg), then strength increases, but carbon equivalent increases and crack resistance decreases
Solution Approach 1:
The patent carefully controls the carbon content (0.06-0.12%) and carbon equivalent through optimized alloying composition. By adjusting the parameters of C, Si, Mn, Cr, Mo, Ni, Ti, and B within specific ranges, the patent achieves high strength grade (≥80 kg) while keeping carbon equivalent at a level that maintains good crack resistance, avoiding the harmful effect of excessive carbon equivalent
3Strength
If alloying elements are increased to improve strength, then tensile strength increases, but production cost increases
Solution Approach 1:
The patent optimizes the composition parameters to achieve high strength with moderate alloying content. By controlling C (0.06-0.12%), Si (0.55-0.80%), Mn (1.60-1.95%), Cr (0.10-0.35%), Mo (0.10-0.50%), Ni (1.00-1.60%), Ti (0.01-0.20%), and B (0.0005-0.006%), the patent achieves high tensile strength without requiring excessive amounts of expensive alloying elements, thereby reducing production cost
Solution Approach 2:
The patent substitutes expensive alloying elements with a balanced composition strategy using moderate amounts of Ni (1.00-1.60% instead of ≥2%) and optimized combinations of Si and Mn. This substitution reduces the quantity of expensive substances required while maintaining the desired strength level, thereby reducing production cost
Data Source
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AI summary
Disclosed is a superhigh strength gas shielded welding wire, the contents of chemical elements of the superhigh strength gas shielded welding wire in percentage by mass being: C 0.06-0.12%, Si 0.55-0.80%, Mn 1.60-1.95%, 0 < Cu ≤ 0.20%, Cr 0.10-0.35%, Mo 0.10-0.50%, Ni 1.00-1.60%, Ti 0.01-0.20%, B 0.0005-0.0060%, and the balance being Fe and other inevitable impurities. Accordingly, further disclosed is a method for manufacturing the welding wire. The welding wire of the present invention has a low alloy content and a low carbon equivalent, and a weld metal formed by welding with the welding wire has all of a higher strength, a greater low-temperature toughness and a better plasticity, with a good compatibility between the three properties. The weld metal formed by welding using the welding wire further has a good crack resistance and a good welding property.