Q590CF is a high-strength steel
The main technical conditions are as follows:
1, the scope
The technical conditions required for good weldability manufacturing heavy vehicles, construction machinery and other steel parts of Q590CF plate thickness ≤ 50mm.
2, grades, said method
Steel grades by the representative of the yield point of the phonetic alphabet (Q), yield strength values, the international representative of the low weld crack sensitivity of the letters CF (crack free) abbreviations and symbols quality level (C, D) form. If Q590CFD.
3, the size, shape, weight and tolerance
Plate size, shape, weight and tolerance should be consistent with GB/T709 requirements.
4, the technical requirements
4.1 Chemical composition (melting analysis)
The chemical composition (melting analysis) should meet the requirements in Table 1.
wt,%
C Si Mn P S Cr Ni Mo V Pcm
≤
0.12 ≤
0.35 ≤
1.60 ≤
0.020 ≤
0.010 ≤
0.80 ≤
1.00 ≤
0.60 ≤
0.08 ≤
0.25
Note: ⑴ To improve performance, be appropriate to add for other trace elements.
⑵ Pcm (%) = C + Si/30 + Mn/20 + Cu/20 + Ni/60 + Cr/20 + Mo/15 + V/10 +5 B;
4.2 smelting method: Steel from the EAF + LF / VD refining
4.3 Delivery status: controlled rolling and controlled rolling and tempering or, specifically in the contract.
4.4 Mechanical and technological properties
Steel mechanical and process performance test results shall meet the requirements in Table 2.
Table 2 Grade Rp0.2, Mpa Rm, Mpa A50,% AKV, J, vertical cold
Q590CFC ≥ 590 ≥ 690 ≥ 16 0 ℃ ≥ 37 D = 3a
Q590CFD -20 ℃
4.5 The surface quality of steel by GB/T3274 implementation.
4.6 Ultrasonic testing
Steel sheets can be carried out by ultrasonic inspection, testing standards and the quality level specified in the contract.
5, test methods
5.1 test each batch of steel items, sample size, sampling methods and test methods comply with the requirements in Table 3.
Test methods in Table 3
No. Test item sample size (a) sampling test methods
A chemical analysis 1 (per tank furnace No.) GB/T222 GB/T223, GB/T4336
2 Stretch 1 GB/T2975 GB/T228
3 cold 1 GB/T232
4 Shock 3 GB/T229
5 sheets by ultrasonic testing / JB / T 4730.3
5.2 test and retest to determine project requirements should be consistent with YB/T4137-2005
6, inspection rules
Steel should be granted acceptance, each batch of steel by the same furnace, the same thickness, the same delivery conditions of steel composition, the weight of each batch of steel is not greater than 30 tons.
7, steel packaging, marking and certification regulations by GB/T247
The main technical conditions are as follows:
1, the scope
The technical conditions required for good weldability manufacturing heavy vehicles, construction machinery and other steel parts of Q590CF plate thickness ≤ 50mm.
2, grades, said method
Steel grades by the representative of the yield point of the phonetic alphabet (Q), yield strength values, the international representative of the low weld crack sensitivity of the letters CF (crack free) abbreviations and symbols quality level (C, D) form. If Q590CFD.
3, the size, shape, weight and tolerance
Plate size, shape, weight and tolerance should be consistent with GB/T709 requirements.
4, the technical requirements
4.1 Chemical composition (melting analysis)
The chemical composition (melting analysis) should meet the requirements in Table 1.
wt,%
C Si Mn P S Cr Ni Mo V Pcm
≤
0.12 ≤
0.35 ≤
1.60 ≤
0.020 ≤
0.010 ≤
0.80 ≤
1.00 ≤
0.60 ≤
0.08 ≤
0.25
Note: ⑴ To improve performance, be appropriate to add for other trace elements.
⑵ Pcm (%) = C + Si/30 + Mn/20 + Cu/20 + Ni/60 + Cr/20 + Mo/15 + V/10 +5 B;
4.2 smelting method: Steel from the EAF + LF / VD refining
4.3 Delivery status: controlled rolling and controlled rolling and tempering or, specifically in the contract.
4.4 Mechanical and technological properties
Steel mechanical and process performance test results shall meet the requirements in Table 2.
Table 2 Grade Rp0.2, Mpa Rm, Mpa A50,% AKV, J, vertical cold
Q590CFC ≥ 590 ≥ 690 ≥ 16 0 ℃ ≥ 37 D = 3a
Q590CFD -20 ℃
4.5 The surface quality of steel by GB/T3274 implementation.
4.6 Ultrasonic testing
Steel sheets can be carried out by ultrasonic inspection, testing standards and the quality level specified in the contract.
5, test methods
5.1 test each batch of steel items, sample size, sampling methods and test methods comply with the requirements in Table 3.
Test methods in Table 3
No. Test item sample size (a) sampling test methods
A chemical analysis 1 (per tank furnace No.) GB/T222 GB/T223, GB/T4336
2 Stretch 1 GB/T2975 GB/T228
3 cold 1 GB/T232
4 Shock 3 GB/T229
5 sheets by ultrasonic testing / JB / T 4730.3
5.2 test and retest to determine project requirements should be consistent with YB/T4137-2005
6, inspection rules
Steel should be granted acceptance, each batch of steel by the same furnace, the same thickness, the same delivery conditions of steel composition, the weight of each batch of steel is not greater than 30 tons.
7, steel packaging, marking and certification regulations by GB/T247
