API 5l X56 Pipe

API 5L X56 pipe is a high-quality, medium-grade carbon steel pipe widely used for transporting oil, gas, and water. With a minimum yield strength of 390 MPa and tensile strength of 490 MPa, API 5L X56 offers durability and strength for critical operations. It is available in both seamless and welded types, including ERW, EFW, and SAW.

There are various uses for this pipe grade in the petrochemical, natural gas and petroleum sectors.  Additionally, onshore, offshore, and sour service environments use it. API 5L X56 seamless pipes are ideal for high-pressure transmission, while welded options like ERW pipes are commonly used in large-scale pipeline systems.

API 5l X56 Pipe

Multi Metals India is a trusted supplier of API 5L X56 pipe offering PSL1 and PSL2 levels. To meet the various needs of the industries these pipes come in standard weight, extra strong and plain end variants. Even in challenging circumstances, their strong design guarantees dependable performances.

Whether for oil refineries, natural gas processing plants, or water projects, API 5L X56 is a reliable choice for safe and efficient transport. Its strength, versatility, and wide range of compatibility make it a popular piping solution all around the world. Looking for a reliable source of API 5L X56 pipe? Contact us today for competitive pricing, fast delivery, and expert support tailored to your project needs.

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Application of API 5l X56 Pipe

Oil & Gas

API 5L X56 pipe handles operating pressures up to 5,570 psi, which positions it firmly in long-distance hydrocarbon transmission. Crude oil trunk lines and natural gas gathering systems account for the largest share of X56 consumption. At a minimum yield strength of 56,000 psi, the grade absorbs the mechanical stress these networks accumulate over years of continuous service.

Chemical & Petrochemical

Offshore platforms route X56 in risers and subsea flowlines where salt water, cyclic loading, and external pressure fluctuations disqualify lower grades. Petrochemical plants run it in high-pressure process headers operating above 1,500 psi. Refineries use it to connect distillation columns to feed preheaters, where pressure spikes during startup demand consistent yield margins.

Structural Applications

Structural applications include foundation casings and driven piles for civil infrastructure. Wall thickness availability from 4.0 mm to 25.4 mm lets engineers match section modulus to site load requirements without overspecifying. Power contractors also specify X56 in steam distribution headers where line temperatures stay within the 120°C threshold for standard carbon chemistry.

 

Specification Table of API 5l X56 Pipe

Specification Details
Product Specification
 API 5L, PSL-1, PSL-2
Size
 1/2″ to 24″, * size above 24” NPS can be arranged on request
Schedule
 SCH10, SCH 40, SCH 80, SCH 160 To SCH XXS as per thickness mentioned in API 5L
Type
 Seamless, Welded, ERW, L-SAW construction
Grade
 Grade X56 and L390

Delivery Condition

PSL Delivery Condition Pipe grade
PSL1 As-rolled, normalized, normalizing formed A
As-rolled, normalizing rolled, thermomechanical rolled, thermo-mechanical formed, normalizing formed, normalized, normalized and tempered or if agreed Q&T SMLS only B
As-rolled, normalizing rolled, thermomechanical rolled, thermo-mechanical formed, normalizing formed, normalized, normalized and tempered X42, X46, X52, X56, X60, X65, X70
PSL 2 As-rolled BR, X42R
Normalizing rolled, normalizing formed, normalized or normalized and tempered BN, X42N, X46N, X52N, X56N, X60N
Quenched and tempered BQ, X42Q, X46Q, X56Q, X60Q, X65Q, X70Q, X80Q, X90Q, X100Q
Thermomechanical rolled or thermomechanical formed BM, X42M, X46M, X56M, X60M, X65M, X70M, X80M
Thermomechanical rolled X90M, X100M, X120M
The suffice (R, N, Q or M) for PSL2 grades, belongs to the steel grade

Manufacturing Process

Multi Metals India produces API 5L X56 pipe through seamless and ERW routes. Seamless pipe starts with a solid billet heated to approximately 1,200°C, pierced on a rotary piercer, then rolled on a pilger mill to reduce wall thickness. A stretch reducer brings the outer diameter within the ±12.5% tolerance prescribed by API 5L.

ERW pipe begins with hot-rolled coil slit to the calculated skelp width. Progressive forming rolls bend the strip into a cylinder, and a high-frequency induction welder fuses the seam at above 1,300°C. A post-weld seam normalizer heats the zone above the Ac3 transformation point, eliminating the hardness peak that causes brittle fracture risk.

Where required by specification, PSL 2 X56 pipe goes through full-body normalization at 880 to 940°C, bringing Charpy V-notch impact energy to the 27-joule minimum at 0°C. Hydrostatic testing, full-body ultrasonic scanning, and magnetic particle inspection of pipe ends complete the quality sequence before dispatch.

Type of Pipe PSL 1 PSL 2
Grade A Grade B X42 to X70 B to X80 X80 to X100
SMLS ✔ ✔ ✔ ✔ ✔
LFW ✔ ✔ ✔
HFW ✔ ✔ ✔ ✔
LW ✔
SAWL ✔ ✔ ✔ ✔ ✔
SAWH ✔ ✔ ✔ ✔ ✔
SMLS – Seamless, without weld
LFW – Low frequency welded pipe, <70 kHz
HFW – High frequency welded pipe, >70 kHz
SAWL – Submerge-arc welding longitudinal welded
SAWH – Submerge-arc welding helical welded

Chemical Composition Table For PSL 1 Pipe With t ≤ 0.984

Steel Grade Mass fraction, % based on heat and product analyses a,g
C Mn P S V Nb Ti
max b max b max max max max max
Seamless Pipe
X56 0.28 1.40 0.03 0.03 d d d
Welded Pipe
X56 0.26 1.40 0.03 0.03 d d d
a. Cu ≤ = 0.50% Ni; ≤ 0.50%; Cr ≤ 0.50%; and Mo ≤ 0.15%,
b. For each reduction of 0.01% below the specified maximum concentration for carbon, an increase of 0.05% above the specified maximum concentration for Mn is permissible, up to a maximum of 1.65% for grades ≥ L245 or B, but ≤ L360 or X52; up to a maximum of 1.75% for grades > L360 or X52, but < L485 or X70; and up to a maximum of 2.00% for grade L485 or X70.,
c. Unless otherwise agreed NB + V ≤ 0.06%,
d. Nb + V + TI ≤ 0.15%,
e. Unless otherwise agreed.,
f. Unless otherwise agreed, NB + V = Ti ≤ 0.15%,
g. No deliberate addition of B is permitted and the residual B ≤ 0.001%

Chemical Composition Table for PSL 2 Pipe With t ≤ 0.984”

Steel Grade Mass fraction, % based on heat and product analyses Carbon Equiv a
C Si Mn P S V Nb Ti Other CE IIW CE Pcm
max b max max b max max max max max max max
Seamless and Welded Pipe
X56N 0.24 0.45 1.40 0.025 0.015 0.10 0.05 0.04 d,e,l 0.43 0.25
X56Q 0.18 0.45f 1.50 0.025 0.015 0.07 0.05 0.04 e,l 0.43 0.25
Welded Pipe
X56M 0.22 0.45 1.40 0.025 0.015 d d d e,l 0.43 0.25
a. SMLS t>0.787”, CE limits shall be as agreed. The CEIIW limits applied fi C > 0.12% and the CEPcm limits apply if C ≤ 0.12%,
b. For each reduction of 0.01% below the specified maximum for C, an increase of 0.05% above the specified maximum for Mn is permissible, up to a maximum of 1.65% for grades ≥ L245 or B, but ≤ L360 or X52; up to a maximum of 1.75% for grades > L360 or X52, but < L485 or X70; up to a maximum of 2.00% for grades ≥ L485 or X70, but ≤ L555 or X80; and up to a maximum of 2.20% for grades > L555 or X80.,
c. Unless otherwise agreed Nb = V ≤ 0.06%,
d. Nb = V = Ti ≤ 0.15%,
e. Unless otherwise agreed, Cu ≤ 0.50%; Ni ≤ 0.30% Cr ≤ 0.30% and Mo ≤ 0.15%,
f. Unless otherwise agreed,
g. Unless otherwise agreed, Nb + V + Ti ≤ 0.15%,
h. Unless otherwise agreed, Cu ≤ 0.50% Ni ≤ 0.50% Cr ≤ 0.50% and MO ≤ 0.50%,
i. Unless otherwise agreed, Cu ≤ 0.50% Ni ≤ 1.00% Cr ≤ 0.50% and MO ≤ 0.50%,
j. B ≤ 0.004%,
k. Unless otherwise agreed, Cu ≤ 0.50% Ni ≤ 1.00% Cr ≤ 0.55% and MO ≤ 0.80%,
l. For all PSL 2 pipe grades except those grades with footnotes j noted, the following applies. Unless otherwise agreed no intentional addition of B is permitted and residual B ≤ 0.001%.

Mechanical properties

Pipe Grade Tensile Properties – Pipe Body of SMLS and Welded Pipes PSL 1 Seam of Welded Pipe
Tensile Strength b
(Rm PSI Min)
Yield Strength a
(Rt0,5 PSI Min)		 Tensile Strength a
(Rm PSI Min)		 Elongation
(in 2in Af % min)
X56 56,600 71,100 c 71,100

Tensile and Yield of – PSL1 and PSL2

Pipe Grade Tensile Properties – Pipe Body of SMLS and Welded Pipes PSL 2 Seam of Welded Pipe
Tensile Strength d
Rm (psi) Min
Yield Strength a
(Rt0,5 PSI)		 Tensile Strength a
(Rm PSI)		 Ratio a,c
R10,5 / Rm
Maximum
Minimum Maximum Minimum Maximum
X56N, X56Q, X56M 56,600 79,000 71,100 110,200 0.93 71,100
a. For intermediate grade, the difference between the specified minimum tensile strength and the specified minimum yield for the pipe body shall be as given for the next higher grade.
b. For the intermediate grades, the specified minimum tensile strength for the weld seam shall be the same as determined for the body using foot note a.
c. The specified minimum elongation, Af, expressed in percent and rounded to the nearest percent, shall be determined using the following equation:
Where C is 1 940 for calculation using Si units and 625 000 for calculation using USC units
Axc is the applicable tensile test piece cross-sectional area, expressed in square millimeters (square inches) , as follows
– For circular cross-section test pieces, 130mm2 (0.20 in2) for 12.7 mm (0.500 in) and 8.9 mm (.350 in) diameter test pieces; and 65 mm2 (0.10 in2) for 6.4 mm (0.250in) diameter test pieces.
– For full-section test pieces, the lesser of a) 485 mm2 (0.75 in2) and b) the cross-sectional area of the test piece, derived using the specified outside diameter and the specified wall thickness of the pipe, rounded to the nearest 10 mm2 (0.10in2)
– For strip test pieces, the lesser of a) 485 mm2 (0.75 in2) and b) the cross-sectional area of the test piece, derived using the specified width of the test piece and the specified wall thickness of the pipe, rounded to the nearest 10 mm2 (0.10in2)
U is the specified minimum tensile strength, expressed in megapascals (pounds per square inch)

U is the specified minimum tensile strength, expressed in megapascals (pounds per square inchg. Lower values fo R10,5IRm may be specified by agreementh. for grades > x90 refer to the full API5L specification.

Tolerances Outside Diameter, Out of roundness and wall thickness

Specified Outside Diameter D (in) Diameter Tolerance, inches d Out-of-Roundness Tolerance in
Pipe except the end a Pipe end a,b,c Pipe except the End a Pipe End a,b,c
SMLS Pipe Welded Pipe SMLS Pipe Welded Pipe
< 2.375 -0.031 to + 0.016 – 0.031 to + 0.016 0.048 0.036
≥2.375 to 6.625 0.020D for 0.015D for
+/- 0.0075D – 0.016 to + 0.063 D/t≤75 D/t≤75
By agreement for By agreement for
D/t≤75 D/t≤75
>6.625 to 24.000 +/- 0.0075D +/- 0.0075D, but max of 0.125 +/- 0.005D, but max of 0.063 0.020D 0.015D
>24 to 56 +/- 0.01D +/- 0.005D but max of 0.160 +/- 0.079 +/- 0.063 0.015D for but max of 0.060 0.01D for but max of 0.500
For For
D/t≤75 D/t≤75
By agreement By agreement
for for
D/t≤75 D/t≤75
>56 As agreed
a. The pipe end includes a length of 4 in ate each of the pipe extremities
b. For SMLS pipe the tolerance apply for t≤0.984in and the tolerances for the thicker pipe shall be as agreed
c. For expanded pipe with D≥8.625in and for non-expanded pipe, the diameter tolerance and the out-of-roundness tolerance may be determined using the calculated inside diameter or measured inside diameter rather than the specified OD.
d. For determining compliance to diameter tolerance, the pipe diameter is defined as the circumference of the pipe in any circumferential plane divide by Pi.
Wall thickness Tolerances a
t inches inches
SMLS pipe b
≤ 0.157 -1.2
> 0.157 to < 0.948 + 0.150t / – 0.125t
≥ 0.984 + 0.146 or + 0.1t, whichever is the greater
– 0.120 or – 0.1t, whichever is the greater
Welded pipe c,d
≤ 0.197 +/- 0.020
> 0.197 to < 0.591 +/- 0.1t
≥ 0.591 +/- 0.060
a. If the purchase order specifies a minus tolerance for wall thickness smaller than the applicable value given in this table, the plus tolerance for wall thickness shall be increased by an amount sufficient to maintain the applicable tolerance range.
b. For pipe with D≥ 14.000 in and t≥0.984in, the wall thickness tolerance locally may exceed the plus tolerance for wall thickness by an additional 0.05t provided that the plus tolerance for mass is not exceeded.
c. The plus tolerance for wall thickens does not apply to the weld area
d. See the full API5L spec for full details

Why Choose Multi Metals India for API 5L X56 Pipe?

Twenty years of manufacturing in carbon steel, alloy steel, and specialty tubular products give Multi Metals India a technical foundation that trading-only suppliers cannot replicate. ISO 9001:2015 certification governs the full production process, and material test reports with third-party inspection documents accompany every shipment.

Inventory depth reduces project risk. We stock X56 pipe across outer diameters from 1/2 inch to 24 inch NPS, wall schedules from SCH 20 through SCH XXS, in both PSL 1 and PSL 2 grades. End finishes, plain end, beveled end, and threaded-and-coupled, ship without added lead time.

Buyers can source matching flanges, fittings, and plate from the same facility, cutting vendor qualification effort on large pipeline packages. Export documentation covers country-of-origin declarations and end-use certificates for clients across the Middle East, Southeast Asia, and Europe. Contact us with your diameter, wall schedule, and delivery date to receive a quote.