Building materials with carbon and low alloy steel mechanical and technical conditions castings

1 Subject Matter and Scope 1.1 This standard specifies the carbon steel and low alloy steel castings grades of materials, technical requirements and inspection rules. 1.2 This standard applies to building materials and machinery in the carbon steel and low alloy steel castings. 2 reference standard GB 223 Chemical analysis of steel and alloy metal tensile test method GB 228 GB 231 Brinell hardness test of metal metal Charpy method GB 2106 (v-notch) impact test method JC 40l. 3 materials processing machinery defects in steel casting requirements JC 40l. 4 Building Materials Technical delivery conditions for steel castings used materials classification and grade 3 steel casting material is divided into two types of carbon and low alloy steel casting, shown in Table 1. Table 1 materials classified material grades ZG200-400 general purpose structural engineering ZG230-450 structural castings castings with ZG270-500 structure, wear-resistant castings cast ZG310-570 strength, wear-resistant cast steel ZG340-640 strength, wear-resistant castings low ZG35Mn strength, wear-resistant castings together ZG45Mn strength, wear-resistant castings gold ZG35MnSi strength, wear-resistant castings cast ZG40Cr strength, wear-resistant cast steel ZG35CrMo strength, wear-resistant castings technical requirements 4.1 4 casting steel chemical composition of the chemical composition should be consistent with the provisions of Table 2: casting of low alloy steel components should be consistent with the requirements in Table 3. Elements in Table 2 the highest grade materials content,% C Mn Si PS residual elements Ni Cr Cu Mo V ZG200-400 0.20 0.80 0.50 0.04 0.04 0.30 0.35 0.30 0.20 0.05 ZG230-450 0.30 0.90 0.50 0.04 0.04 0.30 0.35 0.30 0.20 0.05 ZG270-500 0.40 0.90 0.50 0.04 0.04 0.30 0.35 0.30 0.20 0.05 ZG310-570 0.50 0.90 0.60 0.04 0.04 0.30 0.35 0.30 0.20 0.05 ZG340-640 0.60 0.90 0.60 0.04 0.04 0.30 0.35 0.30 0.20 0.05 Note: â‘ The upper limit is reduced by 0.01% for carbon, allowing increased by 0.04 % of manganese, for ZG200-400 of manganese content up to 1.00%, and the remaining grades up to 1.20% manganese content. â‘¡ not played a residual element of the total 1.00%. Table 3 Material Grade element content% C Mn Si PS Cr Ni Mo V ZC35Mn 0.30-0.40 1.20-1.60 0.30-0.50 ≤ 0.04 – - – - ZG45Mn 0.40-0.50 1.20-1.60 0.30-0.50 ≤ 0.04 – - – - ZG35MnSi 0.30- 0.40 1.10-1.40 0.60-0.80 ≤ 0.04 – - – - ZG40Cr 0.35-0.45 0.50-0.80 0.20-0.40 ≤ 0.04 0.80-1.10 – - – ZG35CrMo 0.30-0.40 0.50-0.80 0.30-0.60 ≤ 0.04 0.80-1.20 – 0.15-0.35 – 4.2 Mechanical properties of castings must be heat treated, cast steel after heat treatment the mechanical properties of the sample should be consistent with the requirements in Table 4, low-alloy steel casting mechanical properties of the specimen should be consistent with the requirements in Table 5. Table 4 Mechanical properties of the lowest grade material under the contract selected Tensile Yield Strength Elongation shrinkage hardness of the impact absorbed energy σs or σ0.2σbδ5ψAkv HB N / mm [2] N / mm [2]%% J ZG200-400 200 400 25 40 30 – ZG230-450 230 450 22 32 25 131-179 ZG270-500270 500 18 25 22 143-197 ZG310-580 310 570 15 21 15 156-217 ZG340-640 340 640 10 18 10 169-229 Note: Table performance of the grades listed for thickness of 100mm below the casting, when the casting thickness exceeds 100mm, table σ0.2 specified yield strength for design reference use. Table 5 Mechanical properties of the lowest grade material under the contract selected Tensile Yield Strength Elongation shrinkage hardness of the impact absorbed energy σs or σ0.2σbδ5ψAkv HB N / mm [2] N / mm [2]%% J ZG35Mn 340 590 14 30 – - ZG45Mn 340 650 11 20 – 196-235 ZG35mnSi 340 560 12 20 20 163-217 ZG40Cr 340 630 18 26 – 165-212 ZG35CrMo 400 650 9 20 – ≥ 180 Note: The table in the mechanical properties of Normalized and Tempered treatment performance. 4.3 machining allowance allowance should be consistent with the requirements in Table 6, the special circumstances by the process requirements. Table 6 mm basic size castings machined surface in the pouring ≤ 120> 120> 260> 360> 500> 630> 800> 1250> 2000> 3150, when large-size note the position of -260 -360-500-630 -800-1250– 2000 -3150 -5000 ≤ 120 top 5 bottom, side 4 – - – - – - – - -> 120 67-260 bottom surface, side 4 5 – - – - – - – -> 260 7 7 surface 8-360 bottom, side 5 5 6 – - – - – - -> 360 top 78910-500 bottom, side 5 6 7 8 – - – - – -> 500 top 899101112– 800 bottom, side 6 7 7 8 8 9 – - – -> 800 top 9101011121314 -1250 bottom, side 7 8 8 9 9 10 11 – - -> 1250 surface 101,112,131,314 1517-2000 bottom, side 8991010111213 – -> 2000 Top 11 1,213,141,415,161,820 -3150 bottom, side 8,910,101,112,131,516 -> 3150 surface 12 14 1,516,171,819,202,224 -5000 bottom, side 10 11 1,213,141,415,161,718 4.4 tolerance main dimensions of the castings 4.4.1 should be consistent with public values ??provided in Table 7. Table 7 mm cast base ≤ 40 740> 63> 100> 160> 250> 400 this size -63-100-160 -250-400-630 tolerance of ± 3.5 ± 4.0 ± 4.5 ± 5.0 ± 5.5 ± 6.0 ± 7.0 Casting Base> 630> 100> 1600> 2500> 4000> 6300 – The size -1000-1600 -2500-4000 -6300-1000 tolerance of ± 8.0 ± 11.5 ± 13.0 ± 15.0 ± 17.5 ± 20.0 4.4.2 tolerance distribution is symmetric need to be used when non-symmetrical distribution, but marked on the pattern or process. 4.4.3 taper angle according to process requirements, and not within the tolerance range. 4.4.4 pouring, riser and riser subsidies must be cut off. Cutting residue shall not exceed the requirements in Table 8. Special circumstances by the process requirements. Table 8 mm water, riser most ≤ 100> 100> 160> 250> 400> 630 large-size -160 -250 -400-630-1000 residues Boss +3 +5 +7 +10 +14 +20 concave – 2-3-3-4-6-6 4.5 general casting casting weight deviation 4.5.1 The weight should not exceed the requirements in Table 9. Table 9 Nominal weight of casting ≤ 100> 100> 1000> 5000 (kg) -1000 -5000 -30000 deviation +8.0 +7.0 +6.0 +5.0% rate -6.0 -5.0 -4.0 -3.0 4.5.2 Nominal weight of the casting casting process weight subject, including the allowance, the amount of such correction process. Assessment can be one of the following methods: a. pass the actual weight of the first pieces of casting. b. In the batch file, take an average of 10 qualified casting weight. 4.6 Quality 4.6.1 casting casting surface does not allow the appearance of cracks, sticky sand, oxide, etc. exist; sand, core sand, flash, burrs, etc. must be removed: pouring, risers and more meat must be removed. 4.6.2 When casting defects. 5 rules for the implementation of inspection by JC401.3 5.1 Chemical Analysis 5.1.1 Chemical analysis test block should be in the middle of pouring ladle or system caries 5. l. 2 Chemical composition analysis by GB 223 regulations. 5.2 Mechanical properties 5.2.1 Mechanical properties of test pieces with the test system should be married in the middle of casting and casting it represents should be conducted with the furnace heat treatment, mechanical properties of casting with a single test block shown in Figure 1; with casting with mechanical properties test block shown in Figure 2. 5.2.2 The tensile test according to GB228 regulations. 5.2.3 Impact test according to GB2106 regulations. 5.2.4 GB23l hardness test according to regulations. 6 inspection rules and inspection rules and technical conditions of delivery and technical conditions of delivery by JC 40l. 4 regulations

This entry was posted in Uncategorized and tagged , , . Bookmark the permalink.

Leave a Reply

Your email address will not be published. Required fields are marked *

*

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>