30CrMo Seamless Steel Tube for Gas Cylinder

Product Description

TORICH GB/T18248 37Mn 30CrMo Seamless Steel Tube for Gas Cylinder

Standard	GB/T18248
Material	37Mn, 34Mn2V, 30CrMo, 35CrMo, 34CrMo4, 30CrMnSiA
Size	OD: 15-800mm  WT: 1.6-50  Length: 4-12m
Techinique	Hot Rolled or Cold Drawn
Delivery Condition	Hot Rolled Steel Tube: Hot Rolled Cold Drawn Steel Tube: Cold Drawn, Annealed or Normalizing
Test	Tensile Test, Impact Test, Hydraulic Test, Eddy Current Test, Ultrasonic Testing etc
Application	Low and Medium Pressure Boiler

Chemical Requirements

Element	37Mn	34Mn2V	30CrMo	35CrMo	34CrMo4	30CrMnSiA
C	0.34-0.40	0.30-0.37	0.26-0.34	0.32-0.40	0.30-0.37	0.28-0.34
Si	0.10-0.30	0.17-0.37	0.17-0.37	0.17-0.37	≤0.40	0.90-1.20
Mn	1.35-1.75	1.40-1.75	0.40-0.70	0.40-0.70	0.60-0.90	0.80-1.10
P	≤0.020	≤0.020	≤0.020	≤0.020	≤0.020	≤0.020
S	≤0.020	≤0.020	≤0.020	≤0.020	≤0.020	≤0.020
P+S	≤0.030	≤0.030	≤0.030	≤0.030	≤0.030	≤0.030
Cr	≤0.30	≤0.30	0.80-1.10	0.80-1.10	0.90-1.20	0.80-1.10
Mo	-	-	0.15-0.25	0.15-0.25	0.15-0.30	≤0.10
V	-	0.07-0.12	-	-	-	-
Ni	≤0.30	≤0.30	≤0.30	≤0.30	≤0.30	≤0.30
Cu	≤0.20	≤0.20	≤0.20	≤0.20	≤0.20	≤0.20

Permissible Variations

Type	Size Range	Permissible Variations in OD %	Permissible Variations in WT %		Permissible Variations in Minimum WT %
			PA	PC	PA	PC
Hot Rolled	D<339.7 mm	±1	+12.5  -10	±10	+25  0	+22.5 0
	D≥339.7 mm		+15  -12.5	+12.5  -10	+30 0	+25 0
Cold Drawn	All	±0.75	±10	±7.5	+22.5 0	+15 0

Mechanical Requirements

Grade	Tensile Strength MPa	Yeild Strength MPa	Elongation %
	min
37Mn	750	630	16
34Mn2V	745	530	16
30CrMo	930	785	12
35CrMo	980	835	12
34CrMo4	980	835	12
30CrMnSiA	1080	885	10

1. Incoming Raw Material Inspection
2. Raw Material Segregation to avoid steel grade mix-up
3. Heating and Hammering End for Cold Drawing
4. Cold Drawing and Cold Rolling, on line inspection
5. Heat Treatment, +A, +SRA, +LC, +N, Q+T
6. Straightening-Cutting to specified length-Finished Measuring Inspection
7. Machanical Testing in own labs with Tensile Strength, Yield Strength, Elongation, Hardness, Impact, Mictrostruture etc
8. Packing and Stocking

100% of our steel tubes are dimensionally checked
100% of our steel tubes are visually checked to assure they have a perfect surface condition and no surface defects.
100% eddy current test and ultrosonic test to eliminate longitudinal and transversal defects.

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FAQ

Q: Are you trading company or manufacturer ?

A: A professional steel pipes materials inventor, manufacturer and solution provider

Q: How long is your delivery time?
A: Generally it is 7-14 days if the goods are in stock. or it is 30-60 days if the goods are not in stock, it is according to quantity.

Q: Do you provide samples of carbon seamless steel tube ? is it free or extra ?
A: Yes, we could offer the sample for free charge but need pay the cost of freight.

Q: What is your terms of payment ?
A: Payment<=1000USD, 100% in advance. Payment>=1000USD, 30% T/T in advance ,balance before shippment.

If you have another question, pls feel free to contact us

TORICH GB/T18248 37Mn 30CrMo Seamless Steel Tube for Gas Cylinder